Surfing For Reaction Distance?

Sandy asks…Guys, has a women said I love you to you first when you least expected it? What was your reaction like?Were you shocked? What did you do?

I said those words to my long distance ex bf on email and he hasnt replied yet. What is going through his mind?
I said those 3 words prematurely.Nancy answers:I thought it was cute as hell :P, i said it back cause i loved her alot too. But i think its sweet, kinds makes ya jump and smile a bit. I love it when the girl says it first :PMandy

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Time?

Helen asks…Horizontal Velocity and Reaction Time?The horizontal velocity of Bruce's fastball pitch is 40 m/s at the instant it's released from his hand. If the horizontal distance from Bruce's hand to home plate is 17.5 m at the instant of release, how much time does the batter have to react to the pitch and swing the bat?Nancy answers:D = VT

17.5 = 40T

Solve for TSteven asks…Physics question, human reaction time?Determine the stopping distances for a car with an initial speed of 97 km/h

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Driving?

Joseph asks…You are driving on the highway at 100 km/hr (60 mi/hr) and there is a car in front of you going the same speed?You see him start to slow immediately. If you are also traveling at 100km/hr (60 mi/hr), how far (in meters) do you travel before you begin to brake? (Note: Your reaction time is .435 s).
Secondly, if you can produce the deceleration of -5.364 m/s^2 when you brake, what will be the total distance you travel before you come to a stop?
If you don't notice the car ahead

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Formula?

David asks…Chemistry Enthalpy Beast ?A sample consisting of 22.7 g of a nongaseous, unstable compound X is placed inside a metal cylinder with a radius of 8.0 cm, and a piston is carefully placed on the surface of the compound so that, for all practical purposes, the distance between the bottom of the cylinder and the piston is zero. (A hole in the piston allows trapped air to escape as the piston is placed on the compound; then this hole is plugged so that nothing inside the cylinder can

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Learning?

William asks…I hate this what should I do?Okay, so my problem comes from the fact that I AM A F*CKING IDIOT! I am a high school sophomore and things were pretty good, I have a girlfriend, but the issues are she is long distance and she is very sexual, while I am very emotional, but we were still good. I had been friends with this girl since last year, and just recently, we went from good friends to best friends. So, I like being friends with her, she’s fun to be around, she’s great,

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Increases?

Jenny asks…Which statement best describes how work and power are different?To find work we need to know force and distance; to find power we need to know force and velocity.

To find work we need to know energy and time; to find power we need to know energy and distance.

To find work we need to know velocity and distance; to find power we need to know distance and time.

To find work we need to know distance and force; to find power we need to know energy and velocity.

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Car?

Linda asks…Significant Digits and Vector Arrows 10pts?In one question, I am measuring the reaction distance of a car travelling at 17m/s and it takes 0.8s for a person to react. So, the reaction distance is 17x0.8. However, my issue is that I don't know how many significant digits to use. It is common sense to multiply those numbers, get 13.6 and round up to 14. But 0.8 has only one significant figure, so would I not have to use one significant number?

Second question, a car is travelling at

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Formula?

Mandy asks…help for physics problem!?A motorist is approaching a green traffic light with the speed v when the light turns to amber.

1)If this reaction time is t during which he makes his decision to stop and applies his foot to the brake, and if the maximum braking deceleration is a, what is the minimum distance D from the intersection at the moment the light turns to amber in which he can bring his car to stop?

(This is what I did)During time t of the reaction, the car is still moving as

Read the rest of the story by clicking here now...

Surfing For Reaction Distance?

Joseph asks…If I marry a Jehovah's witness, how bad could the reaction of her family and church be?I'm a non-religious person that is in the deepest of loves with a Jehovah's Witness girl. How bad would the reaction of the church and her family if we were to go the distance (kids, marriage)? And is it worth it to put a girl through that?
UPDATE:I'm not willing to study or convert. I like being the way I amNancy answers:The Bible teaches us that we should only marry in the Lord, this is to say

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Learning?

Lizzie asks…another one. let me know what you think.?Cause and Effect


Now listen
For an instance at a distance this seems senseless
Like fighting without clinched fists
You’re gonna lose by inches
This is no coincidence considering you lack commonsense
War is dangerous even for the merciless
Unforgiving and cold
Stand bold if you wish to grow old
Weak and weary men never survive till the end
Rules were made to be bent
Look within your soul, my friend
Be proud but never conceited
A

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Driving?

Sandy asks…Good music venues in Southern Cali?Does anyone know of some good music venues between Santa Maria, CA and San Diego other than the Soma or the Chain Reaction?

I've been looking for some good shows to go to within the next month and I don't know of any other places that are within the 2-3 hour driving distance


please help =))Nancy answers:SoftSusan asks…Do you agree with this driving law?I read about this one recently, and thought it'd be interesting to see how others felt on

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Time?

Richard asks…PHYSICS: How do you find time given velocity,acceleration and distance ?The answer is 0.468 seconds.

* A vehicle is travelling at 25.0 m/s. Its brakes provide an acceleration of -3.75 m/s ^2 (forward). What is the driver's maximum reaction time if she is to avoid hitting an obstacle 95.0 m away.Nancy answers:Her "reaction time", Tr is the time between when she sees the obstacle and when she actually applies the brakes. Presumably she'll be traveling at a constant speed during

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Increases?

Jenny asks…Lab: Factors affecting rate of enzyme activity?I did a lab last week but i'm confused about my data. The distance the disc travelled under hydrogen peroxide was equal every time. I began from 80°C which was NOT OPTIMAL temperature & cooled it down to 30°C. So, if the distance was same every time, should the time increase OR decrease as the temperature was decreased (Optimal temp. was unknown) & so what about the reaction rate?:SNancy answers:Enzyme activity generally

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Car?

Jenny asks…Stopping distance - physics?The minimum stopping distance for a car traveling at a speed of 30m/s is 60m, including the distance traveled during the driver's reaction time of 0.46 s.
What is the minimum stopping distance for the same car traveling at a speed of 42 m/s?Nancy answers:The car travels a distance of 0.46 s x 30 m/s = 13.8 m before the brakes are applied

then the brakes cause an acceleration that slows the car to rest in
60m-13.8m = 46.2m

we find the acceleration

Read the rest of the story by clicking here now...

Surfing For Reaction Distance?

Ruth asks…If I marry a Jehovah's witness, how bad could the reaction of her family and church be?I'm a non-religious person that is in the deepest of loves with a Jehovah's Witness girl. How bad would the reaction of the church and her family if we were to go the distance (kids, marriage)? And is it worth it to put a girl through that?
UPDATE:I'm not willing to study or convert. I like being the way I amNancy answers:The Bible teaches us that we should only marry in the Lord, this is to say

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Driving?

Thomas asks…2.50, Distance Acceleration.. Physics test due in few hours Please Help?You are driving to the grocery store at 24m/s. You are 100m from an intersection when the traffic light turns red. Assume that your reaction time is 0.71seconds and that your car brakes with constant acceleration.

How far are you from the intersection when you begin to apply the brakes?

What acceleration will bring you to rest right at the intersection?

How long does it take you to stop?
?
?
?Nancy

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Increases?

Susan asks…cell biology, please help, thanks?1. Enzymes act by
a. lowering the overall change in free energy of a reaction.
b. decreasing the distance reactants must diffuse to find one another.
c. increasing the activation energy.
d. decreasing the activation energy.Nancy answers:C. They decrease the activation of energy,
acts like a catalyst and lowers the speed of reactions.Steven asks…Do the Sun's rays, push the Earth away from the Sun as emission results in sun loosing mass thus less

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Time?

James asks…Physics HELP:What is the minimum stopping distance for the same car traveling at a speed of 40 m/s?The minimum stopping distance for a car traveling at a speed of 30 {m/s is 60 m, including the distance traveled during the driver's reaction time of 0.50 s.What is the minimum stopping distance for the same car traveling at a speed of 40 m/s?Nancy answers:We need to assume that once the driver started applying the brakes, the deceleration was constant.

In the original situation,

Read the rest of the story by clicking here now...

Surfing For Reaction Distance?

Carol asks…Going to see my long distance bf - should I wait to get my first bikini wax?I've never had a bikini wax before. I have sensitive skin. I'm going to see my long distance boyfriend at the end of the month and was thinking of getting a wax before I go (I usually use Nair). I'm worried about having a bad reaction though and it looking/feeling really bad. Should I wait until after I see him so I can test it out first on my own?Nancy answers:You won't need more than a week to be ready

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Learning?

Charles asks…Do i have a chance to make it to the Majors?Ok so i am 13 going to be 14 next year for baseball. I have always wanted to play in the majors and still want to. I do what ever i can to learn more about the game and improve even more. I don't have a real position yet but i play them all good enought. I do play some of them better then others. I am a good infielder. Can field ground balls good and make good throws. Good reaction time with a strong arm and good range. But ive want to

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Car?

Thomas asks…Physics Question: A car is traveling at 25 m/s and the driver sees a traffic light turn red. After 0.600 s ?(the reaction time) the driver applies the breaks, and the car decelerates at 7.00 m/s^2. What is the stopping distance of the car, measured from the point where the driver first notices the red light?Nancy answers:Vo=25
V=0
a=-7
d= ?
T=x

V=25
t= .6
d= ?

V=d/t
d= .024

V^2=Vo^2 + 2ad
0=625+2(-7)d
d= 44.6Charles asks…Suppose a car is traveling at 15.0 m/s, and the

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Formula?

Lizzie asks…Physics Problem, Need answer explanation.?I asked a question earlier, and I got this answer.

v² = u² + 2a(d - d0)....................(*)
where
u = ? this is the initial velocity you are trying to find
v = 0 when the car comes to a rest
a = -10m/s²
d = 60m
now d0 is the distance the car travels during
the reaction time t = 0.85s
you get
d0 = ut
substitute this and v = 0 in (*) gives
0 = u² + 2a(d - ut)
rearrange
u² - 2atu + 2ad = 0
which is a quadratic, the quadratic formula

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Time?

Mary asks…What is the minimum stopping distance for the same car traveling at a speed of 34 ?-Physics QUESTION?The minimum stopping distance for a car traveling at a speed of 30 is 60 , including the distance traveled during the driver's reaction time of 0.51 .


What is the minimum stopping distance for the same car traveling at a speed of 34 ?

Express your answer using two significant figures.Nancy answers:Not enough info but..
You will need...
V² = v₁² + 2ad
Note: If time is not part

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Learning?

Sharon asks…Statistics question: Binomial distribution?Hi guys, could anyone please let me know how to work out the following two questions:

1) Suppose X has a Binomial distribution with E(X) = 27.90 and var(X) = 5.6627. The probability of success, p, for this Binomial distribution is... ?

2) A sample of 30 students measured their reaction time by recording the distance a dropped ruler fell before they caught it. This was then repeated to see whether a learning effect was present. The mean

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Car?

Sharon asks…Suppose a car is traveling at 15.5 m/s, and the driver sees a traffic light turn red. After 0.510 s has?elapsed (the reaction time), the driver applies the brakes, and the car decelerates at 6.20 m/s2. What is the stopping distance of the car, as measured from the point where the driver first notices the red light?Nancy answers:Using kinematic equations"
X = Vot + 0.5 at^2
remember a is negative
x=122 metersJohn asks…How do I solve this physics question?Using the maximum

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Formula?

Helen asks…I need help with a proof!!?A car has an initial velocity v0 when the driver sees an obstacle in the road in front of him. His reaction time is Δtr, and the braking acceleration of the car is a. Show that the total stopping distance is given by the formula below. Remember that a is a negative number.


Sstop = v_0*delta(tr) - (v_0)squared/ 2aNancy answers:The assumption in this question is that the velocity remains constant in the time interval , and then the deceleration begins.

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Driving?

Maria asks…How much distance is between you and the deer when you come to a stop?You're driving down the highway late one night at 20m/s when a deer steps onto the road 35m in front of you. Your reaction time before stepping on the brakes is 0.50s and the maximum deceleration of your car is 10m/s squared.
What is the maximum speed you could have and still not hit the deer?
Answers: distance between you and deer is 5m
Answer: maximum speed you could be going and not hit the deer
is

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Increases?

Helen asks…Look what i found, the physics of a punch/strike!?Your Question
Look what i found, the physics of a punch/strike!?
----------------------------------------...

A vector is a straight line from point A to point B, such as the line your fist travels when moving from your hip to an opponent's chin. Any deviation from the straight line will result in a loss of power.

Displacement is how far the fist is displaced from the hip to the chin along a vector.

Distance is how far the fist

Read the rest of the story by clicking here now...

Surfing For Reaction Distance?

Susan asks…Describe factors affecting vehicle stopping distance including speed,mass,road condition and reaction time?Nancy answers:The faster the car, the greater the stopping distance. This is due to the equation of kinetic energy 0.5 x mass x velocity squared (0.5mv^2). From this, one can see that if the speed is doubled, the braking is multiplied by 4 (2^2 = 4).

The greater the mass of the car, the greater the stopping distance.
Using the above formula again, one can see that doubling

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Car?

Sharon asks…Suppose a car is traveling at +15.7 m/s, and the driver sees a traffic light turn red. After 0.390 s has elapsSuppose a car is traveling at +15.7 m/s, and the driver sees a traffic light turn red. After 0.390 s has elapsed (the reaction time), the driver applies the brakes, and the car decelerates at 9.00 m/s2. What is the stopping distance of the car, as measured from the point where the driver first notices the red light?

please help, need distance. thankxNancy answers:Stopping

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Learning?

Mary asks…Help with social studies homework?. Which pair of basic questions guides geographers in their work? (1 point)
Where are things located? and Why are they there?
What is the climate? and Why has it changed?
When did Earth form? and What is it made of?
Who lived where? and When did they move?
2. To learn more about Earth, geographers organize information according to what themes? (1 point)
region, population, and place
latitude, longitude, and movement
location, population, and

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Formula?

Robert asks…The speed limit in a school zome is 40 km/h. a driver traveling at this speed sees a child run onto the road ?13 m ahead of his car. he applies the brakes and the car decelerates at a uniform rate of 8.0 m/s^2. if the driver's reaction time is .25 seconds, will the car stop before hitting the child?

how and what equation do u set up to get this answer.

i got to the part where i use a formula for distance (x=xi+vit+.5at^2)
if x13 then it does it hit the child. but i don't kno

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Increases?

James asks…More work questions!!!! Help?1. A spring has k = 88 N/m. Use a graph to determine the work needed to stretch it from x = 3.7 cm to x = 5.7 cm, where x is the displacement from its unstretched length.

2. If the speed of a car is increased by 40%, by what factor will its minimum braking distance be increased, assuming all else is the same? Ignore the driver's reaction time.

3. A 1200 kg car rolling on a horizontal surface has speed v = 55 km/h when it strikes a horizontal coiled

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Driving?

Jenny asks…how to do quadtratic matrix problem?Does anyone know how to setup a quadratic matrix such as this??? I understand how to do a simple linear y=mx+b matrix, but this one is confusing the hell out of me!!!!!!!!
Part III Stopping Distance
When driving, the distance required for a car to come to a complete stop is dependent upon the speed of the car
at the time the driver makes the decision to stop. The distance to come to a complete stop has two components,
the reaction distance and

Read the rest of the story by clicking here now...

Surfing For Reaction Distance?

Sandra asks…physics- reaction time/distance/velocity/time?You are driving to the grocery store at 20 m/s. You are 125 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.50 s and that your car brakes with constant acceleration.
(a) How far are you from the intersection when you begin to apply the brakes?

(b) What acceleration will bring you to rest right at the intersection?

(c) How long does it take you to stop?Nancy answers:A) So you travel for

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Time?

Ken asks…how do you find percentage uncertainty in the measured speed of a car?Help!!! Physics Homework!!! :)

Two lines were painted on the road to see how fast the car was traveling. in one such case the lines were painted across the road a distance of 150m apart with an uncertainty of 5m. A motorist was timed to take 4.6s to travel the distance. Reaction time for use of a stopwatch is about 0.1s, giving an uncertainty in the measurement of 0.2s as the button had to be pushed

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Learning?

David asks…someone please help me with my driving test, there are two parts?1 If there is property damage as a result of the collision, and you are unable to locate the owner, you should __________________________.

Continue driving if the damage is hardly noticeable
Write down the vehicle's license plate number and try to contact them later
Wait around until the owner shows up
Leave a note with your name and address

2 Alcohol in excess of ________-proof will absorb more slowly because

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Time?

Chris asks…Help calculating distance and time.?A car traveling 50 km/h can be brought to a stop in a particular distance under controlled braking conditions. For this problem, ignore the reaction time of the driver and find the stopping distance and stopping time after the brakes are applied.

(a) Assuming the force used to bring the car to rest is the same, how much distance is required to bring the car to a stop if the car is traveling 100 km/h, twice as fast as it was originally? The

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Increases?

Carol asks…kinetic energy...................?If the speed of the car is increased by 50%, by what factor will its minimum breaking distance
be increased, assuming all else is the same? Ignore the drivers reaction timeNancy answers:Final velocity = 0
Hence using the eqution of motion v^2 = u^2 + 2as
u1^2 = -2aS1
u2^2 = -2aS2

S2/S1 = ^2

It is given that u2/u1 = 1.5.

S2/S1 = ^2 = 1.5^2 = 2.25
=================================Mary asks…Physics --- Work and Energy --- Please

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Driving?

Helen asks…Texting while driving 'more dangerous than drugs or alcohol.' Your thoughts?Thu Sep 18, 7:39 AM ET



LONDON (AFP) - Texting behind the wheel is more dangerous than driving while under the influence of alcohol or cannabis, researchers said Thursday.

Research carried out on 17 young drivers (aged 17-24) using a simulator found that reaction time slowed by 35% when they were writing or reading text messages while driving. In comparison, reaction time deteriorated by 21% for those

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Formula?

George asks…How To Use Microsoft Excel?How to use microsoft excel to perform analysis for a simply support beam with a point load imposed on it?

span 12m, point load 3kN, possition of point load 5m

length, distance to load and the point load are the input...

distance from load to end, left reaction, right reaction and the max moment are the output...

wat formula should i insert to find the output?Nancy answers:On the Excel help forum :
http://www.excelforum.com/Susan asks…Combined

Read the rest of the story by clicking here now...

Surfing For Reaction Distance?

James asks…Explain in your own words, the meaning of a greater slope, to the graph of reaction distance vs. speed.?PhysicsNancy answers:The greater the slope, the faster the object is going, therefore more distance is covered.

>MattRuth asks…How can you calculate a reaction time of a driver? With the thinking, braking and stopping distance given?Nancy answers:You also need velocity or some way to calculate velocity. Post the problem.Sandy asks…what is the average speed times the

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Car?

Mary asks…What is the shortest possible stopping distance for the car?A 1300 kg car moves along a horizontal road
at speed v0 = 23.1 m/s. The road is wet, so
the static friction coefficient between the tires
and the road is only μs = 0.11 and the kinetic
friction coefficient is even lower, μk = 0.077.
The acceleration of gravity is 9.8 m/s2 .
What is the shortest possible stopping dis-
tance for the car under such conditions? Use
g = 9.8 m/s2 and neglect the reaction time of
the driver.

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Car?

Laura asks…Speed at which car was traveling?If a car was traveling at 70km/h and a child runs onto 45m ahead, how fast will the vehicle be traveling when the child is hit?
The reaction distance is 29m and braking distance is 28m

Thanks in advance.Nancy answers:70 km / hr = 70000/3600 m/s = 19.44 m/s approx.

At 29 m v = 19.44 m/s
The stopping acceleration is sufficient to reduce v to 0 in 28
Total braking time t, and acceleration a can be determined from
-19.44 = a*t
-28 = 1/2 at^2
solving,

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Formula?

Mary asks…Physics homework-Not sure if done right.?The question:
Determine a safe driving distance rule using kinematics (assuming a decceleration rate of about 4.5 m/s^2 and a reaction/throttle-to-brake time of 0.5 sec). Fill in the Table using (whole, rounded off) car lengths (=4.5 m). Hint: Take each speed as initial and calculate how far the care travels in coming to rest.

Find the distance for:
10 mph
20 mph
30 mph
40 mph
50 mph
60 mph
70 mph

***End of Problem***

WHAT I'VE DONE:
I

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Increases?

Ken asks…Action and Reaction?Used these term to fill in the blank: rate,distance, inertia, centripetal force, gravity, friction, velocity, acceleration, air resistance, momentum.

1.) the blade of an ice skate melts the ice beneath it and reduces__.

2.) The sleek shape of a bobsled reduces__ and allows greater speed.

3.) The snowboard sits at the bottom of the hill, unmoving, until John gets on it and pushes it along.__ kept it from moving.

4.) Mark and his friend love the Terminator

Read the rest of the story by clicking here now...

Surfing For Reaction Distance?

Richard asks…what would be the meaning of a non-zero y-intercept to the graph of reaction distance versus speed?Nancy answers:A non-zero y-intercept is a physical impossibility: if the speed =0 (at X = 0), then the reaction distance must = 0 (Y = 0).George asks…How to calculate overall stopping distance?How do I calculate overall stopping distance if:
Stopping distance = reaction distance + Braking distance
Stopping distance = 20.004m + breaking distance

Speed traveled is 60km/h or

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Driving?

Robert asks…Do you think the safe following distance 2 second rule is neccessary?First, take my question seriously.
I've had experiences where I had to come to a complete stop without leaving skid marks within a short distance.
For example, one time I was driving 50 mph and the traffic light ahead turned yellow. I didn't feel I was close enough to go through it. I was about 50 or possibly 75 feet away, so I stopped and made a complete stop behind the stop line of the intersection without a

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Time?

Susan asks…Velocity = Distance/Time.?In Physics class I have these questions involving the equation V=D/T.
And I really dont know how to do them. Could you guys help me, and explain how to do it?

One question is: "An ant moves a distance of 39.4 cm in 7.3 seconds. What is it's speed?"

and: "A goal keeper for a hockey team has a reaction time of 0.40 seconds. A puck travelling at 25.0 metres/second bounces off an opposing players pads without slowing down. How far away must this occus to

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Learning?

Michael asks…explain in details please.?A sample of 25 students measured their reaction time by recording the distance a dropped ruler fell before they caught it. This was then repeated to see whether a learning effect was present. The mean decrease in drop distance between the two trials was 2.00 cm with standard deviation 2.231 cm. The margin of error for a 95% confidence interval for the mean decrease in drop distance for all students is

cm (correct to 2 decimal places)Nancy answers:Let's

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Time?

Betty asks…the average reaction time for a motorist is 0.70 sec. moving at 30 mph, the motorist applies on the brake systthe average reaction time for a motorist is 0.70 sec. moving at 30 mph, the motorist applies on the brake system a force equal to the weight of the car after receiving a signal to stop. what distance does it travel before coming to rest?Nancy answers:Since the force on the brake is equal to its weight, and neglecting all other losses, the deceleration = 9.8 m/s^2 (acc due

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Learning?

Sandy asks…10 points! Calculate the margin of error (told mean, sd and n)?A sample of 24 students measured their reaction time by recording the distance a dropped ruler fell before they caught it. This was then repeated to see whether a learning effect was present. The mean decrease in drop distance between the two trials was 2.73 cm with standard deviation 2.601 cm. The margin of error for a 95% confidence interval for the mean decrease in drop distance for all students is?

Can someone

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Car?

Mandy asks…Determining car stopping distance?Determine the stopping distance in meters for a car (initial speed of 11.2 m/s ) with human reaction time of 1.0 s and maximum braking acceleration -7.55 m/s2 .

I don't need the answer...just help with the equations please!!Nancy answers:T=11.2/7.55 = 1.48s "stop from braking"
vo=11.2 m/s
a=-7.55 m/s^2

t=vo/a
x1 = vo*t+ (1/2)*a*t^2

reaction distance traveled:
x2=vo * 1 second

x=x1+x2****Daniel asks…Braking distance of a car.. help?The

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Driving?

James asks…distance travelled before hitting the brakes?1.Sara's reaction time is 0.7 s. If she is driving 108 km/h, how far would her vehicle travel before hitting the brakes? (1 Mark)
a)18 m
b)19 m
c)20 m
d)21 m


I do not know how to solve this problem question. Please explain to me the steps so I know how to solve the next questions similar to this.
Much appreciated. Thanks !Nancy answers:First, convert km/h to m/s by dividing by 3.6, because you want your final answer in

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Increases?

Mark asks…chemistry help!!!!!10 points!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!?Ok i just took my final exm, and i didn't do so good. so i haave to g back and get at least 8 questions right from it again. so please help me. Did i mention that i'm indanger of FAILING! please help me.

1.)Which of the following atoms contains the same number of neutrons as an atom of Fluorine-19?

Neon-20

Oxygen-19

Sodium-22

Nitrogen-16

2.)What is the name of the acid with the formula H2SO3?

sulfuric acid

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Formula?

Mandy asks…Maths/ Science help!!?a) A car is travelling at 60km/h. If its brakes can decelerate the car at 6m/s, what is it its braking distance? Use the formula V power of 2 = U power of 2 +2ad, where V is the final speed, U is the initial speed, a the acceleration and d the distance travelled.

b) If the driver has a reaction time of 0.8 seconds, what is the reaction distance?

c) What will the stopping distance be?Nancy answers: 60 Km/hr = (60) • (1000) ⁄ (3600) = 16.67

Read the rest of the story by clicking here now...

Surfing For Reaction Distance?

Steven asks…C)Determine the original speed of a car that has a reaction distance of 18?Nancy answers:A lot of assumptions needed.
Reaction distance = 18 m
Reaction time is typically between 0.5 s and 2.0 s

Speed = distance / time
so max likely speed is 18/0.5 = 36 m/s
Min likely speed is 18/2 = 9 m/s
Given the information provided.William asks…Is it true that long distance running slows down reaction time?I was taking a run with my friend the other day and he told me that. It kind of

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Time?

Lizzie asks…At 90 km/h, what distance in metres is represented by a 2.0-s reaction time interval? ?What is the distance for 2.0 s at 120 km/hNancy answers:First convert the km/hr velocity into m/s velocity:

(90*1000)/(60*60) = 25m/s

Distance covered in 2 seconds reaction time = 25*2 = 50m

Same for 120km/hr = 33.33m/s
Distance covered in seconds reaction tme 33.33*2 = 66.66mJames asks…What are some good drills to develop reaction time?I do boxing and Taekwon-Do, so I was wondering if

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Education?

Sandra asks…Why didn't he tell me? If he likes me? GUYS OPINION PLEASE! =]?Hey I generally wanna ask a guy's opinion about something because I really need to know the way you guys think. So basically it's this guy in my class n me n my friends all know that he really likes me n we're like 99% sure about it. Its like the whole class knows about it, as he told his friends and the thing is I like him too! n I told my friends aswell. I knew he liked me since last october (the first time we saw

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Car?

Mandy asks…Help! If the speed of a car is increased by 45%, by what factor will its minimum braking distance be increased?If the speed of a car is increased by 45%, by what factor will its minimum braking distance be increased, assuming all else is the same? Ignore the driver's reaction time.Nancy answers:Because of the equation vi^2 = vf^2 + 2ax, it will be related to the square of the velocity. So in this case the velocity is increased to 1.45 times the original velocity, so the distance

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Increases?

Sharon asks…If the speed of a car is increased by 55%?If the speed of a car is increased by 55%, by what factor will its minimum braking distance be increased, assuming all else is the same? Ignore the driver's reaction time.
_____Nancy answers:Using the work energy theorem:
Ki + W(friction) = Kf
W(friction) = F(friction) * d, distance travelled times the force of friction, this will be negative since the friction vector is pointing opposite of direction of motion.
We know that the car stops

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Learning?

Chris asks…My boyfriends weird reaction to my past?Okay so me and my boyfriend (we've been together for 6 months,long distance relationship) were talking about each others pasts and about our previous relationships. So he told me about his ex and i told him about mine.. And well, my last relationship was like 3 years ago. Basically it was a love triangle with me,my ex and my old best friend.

I got a crush on this guy and my he got a crush on me. We never were officially together cause after

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Formula?

Sandy asks…Does anyone know the formula for this math problem?A powerful hockey player can shoot a puck at 55 m/s. A skilled goalie has a reaction time of about 0.23 s. What is the maximum distance from the goal that the player can shoot so that the puck will reach the goal before the goalie can react to stop it?Nancy answers:Time distance problem
d = v T
if d to goal is less than reaction time x v then the puck is in goal before the goalie can move.

Same problem with drivers and breaking

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Driving?

Ruth asks…You're driving down the highway late one night at 17m/s when a deer steps onto the road 38m in front of you?Your reaction time before stepping on the brakes is 0.50s, and the maximum deceleration of your car is 12m/s.How much distance is between you and the deer when you come to a stop? What is the maximum speed you could have and still not hit the deer?Nancy answers:You take 0.5 seconds to react....at that time you could have travelled some distance and that is given by,

d = speed

Read the rest of the story by clicking here now...

Surfing For Reaction Distance?

Sandy asks…Neglecting reaction time, the distance required for a car to stop is directly proportional to the square of itNeglecting reaction time, the distance required for a car to stop is directly proportional to the square of its velocity. If a car can stop in 8.5 meters at 20 kilometers per hour, approximately how many meters are needed to stop at 50 kilometers an hour?
13.4
21.3
53.1
117.6Nancy answers:Since it is directly proportional we know:

(20km/hr)^2 * x =

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Learning?

Sandy asks…How do i calculate the margin of error for this question?A sample of 25 students measured their reaction time by recording the distance a dropped ruler fell before they caught it. This was then repeated to see whether a learning effect was present. The mean decrease in drop distance between the two trials was 1.36 cm with standard deviation 2.066 cm. The margin of error for a 95% confidence interval for the mean decrease in drop distance for all students is___

please show working,

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Formula?

Sandra asks…Physics formula for stopping distance?today i was learning about a car, with its reaction time and stopping distance.
If I have a car going at say 50 mph how what formula would i use to get the stopping distance (my reaction time is abut 2 seconds)Nancy answers:S = (Vo^2 - 0) / (2a) + VoTr
A useful conversion factor to memorize is 60 mph ≡ 88 fps, or 15 mph = 22 fps.

Plugging in values we know in the equation above,
s = ^2 / (2a) + (2 s)

s = (24,200 ft^2/s^2) / (3a) +

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Car?

George asks…Once the brakes have been applied, about how many feet does a car which was going 70mph travel before it stops?Can anyone tell me how to calculate for the braking distance of a car travelling at Xmph...? Say, once the brakes have been applied, about how many feet does a car which was going 70 mph travel before it comes to a stop? And another question is how to calculate for the reaction distance for a car travelling at Xmph...? Eg. About how many feet will the average driver

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Driving?

Donna asks…What is your reaction to people who drive in the wrong side?Do you feel such driving is ok for small distance or It should not happen at all.I get frustrated by people who enjoy driving in the wrong side just for fun.
@red top : they let go if you bribe them.Nancy answers:Depends on which country you're in. If they are doing it for fun, then I'd say, if I hit them, its their fault and they will pay to fix my car. I don't think its ever good to drive on the wrong side, because you

Read the rest of the story by clicking here now...

Surfing For Reaction Distance?

Daniel asks…How do I calculate this reaction distance?The question is: Calculate the reaction distance at 120km/h (=33.3 m/s) for a drive with a reaction time of 0.75 seconds.

What is the formula for this?

Thanks if you can helpNancy answers:The reaction distance is the distance the car travels while the driver is reacting.

Reaction distance = speed x reaction time = 33.3 x 0.75 = 25mRichard asks…how are Reaction Distance and Braking Distance related to Stopping Distance.?My answer is:

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Education?

Daniel asks…How often should I talk to my girlfriend in a long distance relationship? Long but with help you & 10 points!!?(Will give 10 points & answer 3 of your questions each)Ok so we have been dating since sep. but have known each other since july. She moved about 15 hrs away for school in mid aug. so havent seen her for awhile until a week ago when i went to see her for 5 days. And she will be coming back home in 20 days & then dec. 10th she is done with her semester of

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Time?

Donald asks…How do i convert distance into time?I am doing a biology experiment about the effect of caffeine on reaction time. I have found the average distance for my 6 subjects and i now need to convert these results into time eg, one of the average distance is 25.25cm how do i convert it?
ThanksNancy answers:It depends. What do you mean by "average distance"? What exactly were you measuring?Paul asks…Physics: I am having problems with this physics problem about reaction time?A

Read the rest of the story by clicking here now...

Surfing For Reaction Distance Increases?

Laura asks…Science Question: Road Science?Please help me if you can with any or all of the 5 questions below, Thank you! :)

1) In road science, give 2 examples where it is good to have friction and 2 where it is not good.

2) when a car has to slow down for a set of traffic lights, what kind of acceleration does it undergo?

3) Cars have crumple zones, explain what it is and how it works with refference to force and change in momentum.

4) Why is it that the reaction distance increases with

Read the rest of the story by clicking here now...