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July 29, 2014

Search: In coming to a stop, a car leaves skid marks 78 m long on the highway. Assuming a deceleration of 6.50 m/s^2, estimate the speed of the car just before braking

Number of results: 14,333

physics
A car leaves skid marks 90 long on the highway in coming to a stop. Assuming a deceleration of 3.5m/s^2, estimate the speed of the car just before braking.
July 5, 2011 by izzy

Physics
In coming to a stop, a car leaves skid marks 88 m long on the highway. Assuming a deceleration of 7.50 m/s2, estimate the speed of the car just before braking.
August 30, 2012 by Carlee

physics
In coming to a stop, a car leaves skid marks 77 long on the highway Assuming a deceleration of 7.20 , estimate the speed of the car just before braking
September 11, 2012 by Anonymous

physics
In coming to a stop, a car leaves skid marks 77 long on the highway Assuming a deceleration of 7.20 , estimate the speed of the car just before braking
September 11, 2012 by Anonymous

physics 1
In coming to a stop a car leaves skid marks 92m long on the highway. Assuming a decceleration of 7.00m/s^2, estimate the speed of the car just before braking.
September 13, 2010 by john

VARIATION- ALGEBRA 2
The length of skid marks a car makes when braking varies directly with the square of the speed of the car. If a car traveling 25 mph leaves skid marks 30 ft long, how long would the skid marks be if the car is traveling 40 mph??
March 5, 2014 by Amy

calc
a) A car is traveling at 50 mi/h when the brakes are fully applied, producing a constant deceleration of 40 ft/s^2. What is the distance covered before the car comes to a stop? b) A car braked with a constant deceleration of 40 ft/s^2 and produced skid marks measuring 160 feet...
November 22, 2009 by Jill

Science
At an accident scene, 276-m long skid marks are found on the road. If the car that made these skid marks can decelerate at 9.8 m/s2, how fast was the car going before braking?
November 3, 2011 by Ray

Zeeland WEST
In a car accidnet involving a sports car, skid marks as long as 290 m were left by the car as it decelearted to a complete stop. The police report cited the speed of the car before breaking as beeing in excess of 100mph 161 km/m. Suppose that i took 10 seconds for the car to ...
September 29, 2010 by Abrahm

Algebra 2
The Formula s= sqrt 30fd can be estimated the speed of s, in miles per hour that a car is traveling when it goes into a skid, where f is the coefficient of friction and d is the length of the skid marks in feet. Kody skids to a stop on a street with a speed limit of 35 mi/h. ...
January 21, 2013 by Ana

math
Use the following situation to answer the next four questions. The formula for these questions came from the police department. They use this formula to determine the speed at which the car was going when the driver applied the brakes, by measuring the distance of the skid ...
March 1, 2012 by krysta

math
Use the following situation to answer the next four questions. The formula for these questions came from the police department. They use this formula to determine the speed at which the car was going when the driver applied the brakes, by measuring the distance of the skid ...
March 3, 2012 by alyssa

algebra
Use the following situation to answer the next four questions. The formula for these questions came from the police department. They use this formula to determine the speed at which the car was going when the driver applied the brakes, by measuring the distance of the skid ...
March 3, 2012 by alyssa

Physics
A 1500kg car skids to a halt on a wet road where μk= 0.53. How fast was the car traveling if it leaves 62-m-long skid marks?
October 28, 2009 by Angela

Physics
a car leaves skid marks 84 m long on the highway. Assuming a deceleration of 7.50 m/s2, estimate the speed of the car just before braking.
September 19, 2011 by Shay

mathematics
A car braked with a constant deceleration of 45ft/s^2 producing skid marks measuring 55 ft before coming to a stop. How fast was the car traveling when the brakes were first applied? Please round the answer to the nearest hundredth. Vo= ft/s Vintial^2 - Vfinal^2= -2*...
April 14, 2007 by Julia

College Physic
2) A car traveling with 5 m/s encounters a deer. The drivers slams on the breaks, the breaks lock. The car skids to a complete stop on the road ahead (and the deer runs away). Why does the car stop (where does all the kinetic energy it had go)? Find the magnitude of the ...
March 23, 2012 by Mary

Physics
Police find skid marks 60 m long on a road showing where a car made an emergency stop. Assuming that the deceleration was -10m/s2, how fast was the car going?
February 9, 2014 by Jeff

Alg2
Help w/Word Prob: LAW ENFORCEMENT A police accident investigator can use the formula s=2√5l to estimate the speed=s of a car in miles per hour based on the length=l in feet of the skid marks it left. How fast was a car traveling that left skid marks 120 feet long?
December 4, 2011 by Rock

Physics
Police find skid marks 66 m long on the highway showing where the car made an emergency stop. Assuming that the acceleration was -10 m/s2 (about the maximum for dry pavement), how fast was the car going?
September 5, 2011 by Katie

Algebra
The formula r =2 sqrt.5L can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will a car skid at 60 mph?
March 31, 2014 by Pam

Algebra
The formula r=2sqrt(...)5L can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will a car skid at 70mph?
April 2, 2014 by George

Math 117
The formular r= 2 cube root5L can beusedto approximate the speed r,in mile per hour,of a car that has skid marks of lenght L,in feet. How far will a car skid at 60 mph.
February 12, 2012 by Joseph

calculus
A car braked at a constant deceleration of 45 ft / s2, producing a skid mark measuring 115 feet before coming to a stop. How fast was the car travelling when the brakes were first applied?
November 16, 2010 by Joey

calculas
A car braked at a constant deceleration of 45 ft / s2, producing a skid mark measuring 105 feet before coming to a stop. How fast was the car travelling when the brakes were first applied?
December 4, 2011 by jordan

physics
You are driving a car 33 down the road. The stoplight in front of you suddenly turns red and you slam on the brakes, skidding to a halt. You get out of the car and measure the skid marks made by your tires to be 23.5 meters (Assume positive x to be in the forward direction) ...
January 11, 2013 by Ashley

physics
you are driving your new car 14.0m/s east when you slam on your brakes to avoiavoid having your first collision. The force of friction on your car tires is 1.5kN and the combined mass of your car is 1200kg. Detemine the (a). direction of the frictional force causing your car ...
October 8, 2012 by paru

Physics
Police find skid marks 180 meters long on a highway where a car made an emergency stop. Assuming that the deceleration was a = 10 m/s (about the maximum for dry pavement), how fast was the car traveling before the brakes were applied?
November 14, 2013 by lee

physics
You are driving a car 35mi/h down the road. The stoplight in front of you suddenly turns red and you slam on the brakes, skidding to a halt. You get out of the car and measure the skid marks made by your tires to be 28.5m meters. (Assume positive x to be in the forward ...
September 1, 2013 by JIll

Physics
Police examine the scene of an accident involving two cars, which is parked. The skid marks of the moving car, which nearly came to a stop before the collision, is 80 meters long. The coefficient of kinetic friction between rubber and the pavement is about .80. Estimate the ...
November 25, 2012 by Tim

Math
The formula r=2sqrt(...)5L can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will Acari skid at 20 mph?
April 1, 2014 by Teddy

physics
A 1000 kg car in neutral gear slow from 15 m/s to a stop in 5.0 s due to the force of friction. A. What was the acceleration of the car. B. What was the cars initial momentum? C. What was its final momentum? D. What was the change in momentum of the car? E. What was the ...
October 23, 2011 by Anonymous

math
hi.A vehicle weighing 1.3 tonne leaves skid marks 23 meters long.After 15 meters it hit pedestrain.The co efficient of friction is .7 .what was vehicle initial speed at start of skid and at impact.thanks
February 5, 2013 by glenn

physics
hi.A vehicle weighing 1.3 tonne leaves skid marks 23 meters long.After 15 meters it hit pedestrain.The co efficient of friction is .7 .what was vehicle initial speed at start of skid and at impact.thanks
February 5, 2013 by glenn

Math
A refrigerated truck leaves a rest stop traveling at a steady rate of 56 mi/h. A car leaves the same rest stop 1/4 h later followinf rhe truck at a steady rate of 64 mi/h. How long after the truck leaves the rest stop wil the car overtake the truck. In algebra form.
January 27, 2011 by Please help

physics
a car skids to a halt at a rate of -9.4 m/s2. the skid marks measure 34 m. what speed was the car going when it slammed on the brakes?
September 17, 2012 by karla

Physics
1200kg car moving at 9.72m/s runs into and sticks to a parked 1000kg car. The collision takes 0.15s and after the crash the cars wheels lock and they skid to a stop on the u=0.40 road. what is the distance travelled before skidding to a stop?
February 17, 2014 by Ann

determining speed
car leaves a 20 ft. skid mark how fast was the car traviling
January 12, 2011 by karl

Physics (URGENT!)
-vehicle 1: 2,060lbs -vehicle 2: 5,800lbs -both roads are 45mph -The cars were impacted at right angles -roadway was dry, 69 degrees -friction between tire & road: .60=mu -skid marks (PRIOR to impact): v1=20ft, v2=7ft. *you can find the entire problem w/ more info online if ...
January 18, 2011 by Esora

physics
2 cars of equal mass m collide at an intersection. Driver E traveled eastward and driver N northward. After the collision, 2 cars remain joined together and slide, before coming to a rest. Police measured the skid mark length d to be 9metres. Coefficient of friction is 0.9. ...
May 3, 2007 by Kim

physics
2 cars of equal mass m collide at an intersection. Driver E traveled eastward and driver N northward. After the collision, 2 cars remain joined together and slide, before coming to a rest. Police measured the skid mark length d to be 9metres. Coefficient of friction is 0.9. ...
May 3, 2007 by Kim

algebra
If a car leaves a skid mark of 500 feet, how fast was the car traveling? Using the formula r=25L
April 23, 2012 by Coach

physics
A car moving at 35 mi/h is stopped by jamming on the brakes and locking the wheels. The car skids 53 ft before coming to rest. How far would the car skid if it were initially moving at 56 mi/h?
August 1, 2011 by Ashley

physics
A 1200 kg car moving at 35kph runs into and sticks to a parked 1000kg car. the collision takes 0.15s and after the crash the car's wheels lock and they skid to a stop on the mu= 0.40 road. the final speed of both cars is 5.3m/s a) find the distance tranvelled before skidding ...
November 26, 2009 by sammeh

mechanical science
11. In an accident a freeway sports car made skid marks 200 m long along the pavement. The police estimated the braking acceleration of the car to be 0.8g under the road conditions prevailing. Determine the speed of the sports car when the brakes were applied.
December 20, 2012 by anshuman kumar

physics
a car traveling at 30.0m/s undergoes a constant negative accerleration of magnitude of 2.00m/s^2 when the brakes are applied. how many revolutions does each tire make before the car comes to a complete stop,assuming thaat the car does not skid and that the tires have radii of ...
February 23, 2009 by nay

physics
A car initially traveling at 31.0 m/s undergoes a constant negative acceleration of magnitude 2.00 m/s2 after its brakes are applied. (a) How many revolutions does each tire make before the car comes to a stop, assuming the car does not skid and the tires have radii of 0.330 m...
March 27, 2010 by Kelsey

physics
A certain cable car is San Francisco can stop in 10 s when traveling at maximum speed. On one occasion, the driver sees a dog a distance d m in front of the car and slams on the brakes instantly. The car reaches the dog 7.78 s later, and the dog jumps off the track just in ...
September 15, 2011 by ashley

physics
A 1600 kg car traveling at a speed of 31 m/s skids to a halt on wet concrete where uk = 0.60. how long are the skid marks?
October 2, 2010 by mike

Physics
A car initially traveling at 33.4 m/s undergoes a constant negative acceleration of magnitude 1.80 m/s2 after its brakes are applied. (a) How many revolutions does each tire make before the car comes to a stop, assuming the car does not skid and the tires have radii of 0.330 m...
November 28, 2009 by Ed

Physics
A car initially traveling at 33.4 m/s undergoes a constant negative acceleration of magnitude 1.80 m/s2 after its brakes are applied. (a) How many revolutions does each tire make before the car comes to a stop, assuming the car does not skid and the tires have radii of 0.330 m...
November 28, 2009 by Ed

Math-Algebra
If Noah made skid marks of 350 ft long after a car accident, was he overspeeding before the event?
October 9, 2013 by McKenna Louise

physics
A driver of a 7100 N car passes a sign stating "Bridge Out 30 Meters Ahead." She slams on the brakes, coming to a stop in 10 s. How much work must be done by the brakes on the car if it is to stop just in time? Neglect the weight of the driver, and assume that the negative ...
October 18, 2009 by Steve

physics
A driver of a 7550 N car passes a sign stating "Bridge Out 25 Meters Ahead." She slams on the brakes, coming to a stop in 10 s. How much work must be done by the brakes on the car if it is to stop just in time? Neglect the weight of the driver, and assume that the negative ...
October 19, 2010 by jesse

physics
A driver of a 7550 N car passes a sign stating "Bridge Out 25 Meters Ahead." She slams on the brakes, coming to a stop in 10 s. How much work must be done by the brakes on the car if it is to stop just in time? Neglect the weight of the driver, and assume that the negative ...
October 19, 2010 by jesse

physics
A driver of a 7550 N car passes a sign stating "Bridge Out 25 Meters Ahead." She slams on the brakes, coming to a stop in 10 s. How much work must be done by the brakes on the car if it is to stop just in time? Neglect the weight of the driver, and assume that the negative ...
October 19, 2010 by jesse

PHYSICS
A driver of a 7400 N car passes a sign stating "Bridge Out 30 Meters Ahead." She slams on the brakes, coming to a stop in 10 s. How much work must be done by the brakes on the car if it is to stop just in time? Neglect the weight of the driver, and assume that the negative ...
October 24, 2010 by spencer

Math-Algebra
Mrs. Fine had a car accident. According to the police investigation, her car make skid marks which were 42 ft in length. What was the speed of the car of Mrs. Fine at the time of the accident? Did she manage to follow the speed limit?
October 22, 2013 by McKenna Louise

physic
Hi!Need help please. Question:A car initially traveling at 24.0 m/s undergoes a constant negative acceleration of magnitude 2.10 m/s2 after its brakes are applied. (a) How many revolutions does each tire make before the car comes to a stop, assuming the car does not skid and ...
November 14, 2009 by Chan

College Physics
A 1200-kg car going 30 m/s applies its brakes and skids to rest. If the friction force between the sliding tires and the pavement is 6000 N, how far does the car skid before coming to rest? Can you help me get the formula to use . Thanks
February 11, 2010 by edwin

Physics
if a vehicle with a mass of 5,800lbs left skid marks that were 7ft. long, how fast were they going? the concrete to tire coefficient of friction was .60 also, if a vehicle was 2,060lbs with skidmarks that were 20ft. long? same coefficient. they're supposed to be going 45mph, ...
January 18, 2011 by Esora

Physics
A 2000 {\rm kg} car traveling at a speed of 13 {\rm m/s} skids to a halt on wet concrete where mu_k = 0.50. How long are the skid marks? I tried doing this many times and each answer is wrong. Can someone help?
July 17, 2011 by falcon306

Physics
A car with mass of 1875kg is traveling along a country road when the driver sees a deer dart out onto the road. The driver slams on the brakes manages to stop before hitting the deer. The driver of a second car with 2135kg is driving too close and does not see the deer. When ...
October 4, 2010 by Shaila

alg
1. (20 points) Police use the equation to estimate the speed (s) of a car, in miles per hour, based on the length (x), of its skid marks upon sudden braking on dry asphalt. a. Solve this equation for d. b. A motorist is involved in an accident. The skid marks are measured to ...
July 23, 2011 by patricia

science
Instructions: Read the following paragraph carefully. Then use what you know about momentum, work, and energy to answer the following questions. Be sure to show your work. You are a traffic accident investigator. You have arrived at the scene of an accident. Two cars of equal ...
October 27, 2010 by Anonymous

Physics
A car travels at 64 mi/h when the brakes are suddenly applied. Consider how the tires of a moving car come in contact with the road. When the car goes into a skid (with wheels locked up), the rubber of the tire is moving with respect to the road; otherwise, when the tires roll...
September 21, 2012 by Anne

physics
A driver of a 7.50 N car passes a sign stating "Bridge Out 30 Meters Ahead." She slams on the brakes, coming to a stop in 10.0 s. How much work must be done by the brakes on the car if it is to stop just in time? Neglect the weight of the driver, and assume that the negative ...
October 21, 2007 by Anonymous

Physics
Attempting to stop on a slippery road, a car moving at 90 km/h skids across the road at a 30 angle to its initial motion, coming to a stop in 3.8s. Determine the average acceleration in m/s^2, using a coordinate system with the x-axis in the direction of the car's original ...
March 27, 2013 by James Baker

AP Physics
1. A car is traveling down the road at a constant speed of 11 km/h. At time zero it is forced to stop. The driver slams on the brakes and the car travels 18 m as it uniformly accelerates, coming to a stop. The car remains at rest for 5.0 seconds. Then the driver shifts into ...
September 8, 2011 by ThinkPink

physics
a 1200 kg car going 30 m/s applies its brakes and skids to rest. if the friction force between the sliding ires and the pavement is 6000 N, how far does the car skid before coming to rest. I know the ans is 90 m what work/energy formula should i use to get this answer? can you...
February 11, 2010 by edwin

Algebra help needed!
Recall that on some roads, a skid mark of length L ft. indicates that a car was traveling at least s mph, where s is approx. 2 times the square root of 5L. If a car stopped quickly from a speed of 55 mph, about how long would the skid marks be? Please note that we don't do ...
May 3, 2007 by Lindsay

Physics
A car slams on its brakes, coming to a complete stop in 4 sec. The car was traveling north at 60 mph. Calculate the acceleration
September 13, 2010 by April

Physics
The deceleration(negative acceleration) of an automobile in a full skid on the dr pavement is a little greater than one half "g" or half the acceleration you would experience in free fall. Suppose you are going down the high way and you suddenly decide you need to stop your ...
April 18, 2011 by ron

physical science
A car slams on its brakes, coming to a complete stop in 4.0 sec. The car was traveling north at 60.0 mph. Calculate the acceleration.
June 27, 2011 by pat

Physics- Newton's 1st and 2nd Law
Please help me :( Briefly explain the following scenario's using Newton's first law. a) Trevor wants to tow Kevin's car with his truck. He attached a small tow rope between the vehicles and leaves the rope slack (loose). Trevor quickly accelerates forwards making the rope ...
October 14, 2010 by Emily

Physics
a train is moving at 45km/h when a coupling breaks and the last car separates from the train. as soon as the car separates, the brakes are automatically applied, locking all wheels of the runaway car and causing a uniform decelaration of 5 m/s^2. determine the distance the car...
February 19, 2012 by marco

physics
A 2000 kg is released from a height 20m, and hits a 700kg car at the bottom of the swing. The car is sent horizontally 30, before coming to a stop, and the ball is going 12m/s immediately after they hit. What force of friction is acting between the car and the ground?
February 18, 2014 by Tristan

physics
a car moving at 15 meters per second skids to a stop in 20 meters. if the car travels at 45 meters per second, how far will it skid, assuming the same constant braking force
December 12, 2010 by Anonymous

AP Physics
To test the performance of its tires, a car travels along a perfectly flat (no banking) circular track of radius 120 m. The car increases its speed at uniform rate of at ≡ d |v| dt = 2.99 m/s 2 until the tires start to skid. If the tires start to skid when the car ...
October 24, 2012 by Noah

Physics
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 4.8 m/s2 for 4.5 seconds. It then continues at a constant speed for 9.9 seconds, before applying the brakes such that the car...
January 22, 2011 by Jeel

physics
If the tires of the car in previous problem didnt skid, the coefficient of friction would have been 0.70. Would the force of friction be greater, lesser, or same? Would the car come to a stop in a shorter, same, or longer distance?
August 17, 2011 by Anonymous

Math
A truck traveling at an average rate of 45 miles per hour leaves a rest stop. Fifteen minutes later a car traveling at an average rate of 60 miles per hour leaves the same rest stop traveling the same route. How long will it take for the car to catch up with the truck?
February 12, 2013 by nick

Physics
Could someone try helping me solve those 2 questions or write me a formula with equaion what to do , thanks for every bit of help A 600kg elevator accelerates upward from rest for 10 seconds through 40.0meters. Find the cable tension a) 5130 N b) 5400 N c) 6360 N d) 6630 N A ...
January 27, 2010 by needhelp

Calculus, AntiDerivatives
I need help with this problem: A car traveling at 43 ft/sec decelerates at a constant 5 ft per second squared. How many feet does the car travel before coming to a complete stop? I'm not sure where to start, i know how to find antiDerivatives, but i dont even know the equation...
November 23, 2006 by Mike

Physics
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 3.5 m/s2 for 3.6 seconds. It then continues at a constant speed for 10.1 seconds, before applying the brakes such that the ...
January 24, 2011 by Hayls

Physics
Given: 90m skid mark .50 coefficient of friction between the tires and skid mark How fast is the car moving when the brakes initially applied?
November 18, 2010 by JC

physics
You're quietly sitting by a street one day, enjoying the sun, when you notice a speeding car traveling at 20 m/s down the street. The driver notices that there's a stop sign in the street and hits the brakes 40 m before the stop sign, coming to a stop right at the sign itself...
May 20, 2013 by hemant

Calculus
A car traveling at 42 ft/sec decelerates at a constant 7 feet per second squared. How many feet does the car travel before coming to a complete stop?
April 26, 2012 by Izzy

physics
a 2250 kg car is traveling at 20 m/s to the west. the force required to stop the car at 7890 N to the east. How long will it take the car to stop? How far would the car move before stopping?
February 25, 2014 by Karen

physics
A truck is traveling at 12 m/s down a hill when the brakes on all four wheels lock. The hill makes an angle θ = 15 with respect to the horizontal. The coefficient of kinetic friction between the tires and the road is 0.7. How far does the truck skid before coming to a stop?
October 9, 2010 by jamie

physics
A car travels along a roadwith a speed of v=25 m/s (about 50 mi/h). The coefficient of kinetic frictionbetween the tires and the pavement is mu k=.55. a). If the driver applies the brakes and the tires "lock up" so that they skid along the road, how far does the car travel ...
September 23, 2010 by Holly

Physics
A 14,245N auto with a velocity of 6.0m/s crashes into a brick wall. If the car moves 64.0 cm before coming to a stop, what average force does the car exert on the wall?
January 13, 2011 by Dani

Physics
A 14,245N auto with a velocity of 6.0m/s crashes into a brick wall. If the car moves 64.0 cm before coming to a stop, what average force does the car exert on the wall?
January 13, 2011 by Dani

physics
A car initially going 30ft/sec brakes at a constant rate (constant negative acceleration) coming to a stop in 4 seconds. How far did the car travel?
April 21, 2011 by kimberly

physics
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 4.6 m/s2 for 4.4 seconds. It then continues at a constant speed for 8.5 seconds, before applying the brakes such that the car...
September 13, 2011 by a

physics
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 5.5 m/s2 for 4.9 seconds. It then continues at a constant speed for 6.7 seconds, before applying the brakes such that the car...
January 27, 2014 by kayle

physics
An automobile weighing 15000n crashes into a wall with a velocity of 5m/sec. If the car moves .15m before coming to a stop, what average force does the car exert? on the wall?
January 27, 2011 by bird

physics
A car comes to a stop for a stop sign in 4.6 seconds. If it was initially traveling at 27.5 m/s, how much space did it take for the car to stop?
September 17, 2011 by Steve

physics
Which situations are examples of a particle with a non-zero acceleration? (Select all that are true for full credit.) a)A car driving around a circular track at constant speed. b)A child going back and forth on a swing c)A runner moving in a straight line with a constant speed...
April 18, 2012 by Sally

physics
In an auto accident, a car hit a pedestrian and the driver then slammed on the brakes to stop the car. During the subsequent trial, the driver's lawyer claimed that the driver was obeying the posted 35.0 mph speed limit, but that the limit was too high to enable him to see and...
March 6, 2011 by mary

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