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March 7, 2014

# Search: A car with an initial speed of 23.9 km/h ac-

Number of results: 52,410

physics
How large must the coefficient of static friction be between the tires and the road if a car is to round a level curve of radius 95-m at a speed of 80 km/h.
Sunday, February 7, 2010 at 8:42pm by Anonymous

Physics
How large must the coefficient of static friction be between the tires and the road if a car is to round a level curve of radius 85 m at a speed of 95 km/h?
Sunday, March 25, 2012 at 7:24pm by Kristina

Physics
A racing car with mass (including the driver) of 900 kg accelerates from rest to a speed of 200 km/hr in 6 seconds. what is the power output of the engine?
Tuesday, September 4, 2012 at 10:23pm by Ftin

Physics
A 47.0 g golf ball is driven from the tee with an initial speed of 54.0 m/s and rises to a height of 23.8 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. J (b) What is its speed when it is 10.0 m below its highest point? m/s
Saturday, November 1, 2008 at 2:23pm by Brandon

Physics
An automobile with an initial speed of 3.56 m/s accelerates uniformly at the rate of 2.7 m/s2. Find the displacement of the car after 4.1s.
Thursday, February 3, 2011 at 11:54am by Courtney

PHYSICS
A 5630 kg open railroad car coasts along with a constant speed of 8.64 m/s on a level track. Snow begins to fall vertically and fills the car at a rate of 3.50 kg per minute. Ignoring friction with the tracks, what is the speed of the car after 94.8 min?
Wednesday, June 6, 2012 at 10:38am by Matthew Goldberg

Physics
A soccer ball is kicked with an initial speed of 23 m/s at an angle of 20° with respect to the horizontal.(a) Find the maximum height reached by the ball. (b) Find the speed of the ball when it is at the highest point on its trajectory. (c) Where does the ball land? That is, ...
Saturday, October 20, 2012 at 2:53pm by Anne

MATHS
Train B is faster than train C. Train B's speed over train C has to travel 100m+200m in 2 minutes. Excess speed = (100+200)/120 m/s convert this to km/hr. Add excess speed to 120 km/hr would then give the speed of train B.
Wednesday, June 23, 2010 at 5:58am by MathMate

physics
The pilot of an aircraft wishes to fly due west in a 46.8 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 204 km/h. (a) In what direction should the aircraft head? ° north of west (b) What should its speed relative to the ground be? km/h
Thursday, December 13, 2012 at 8:08pm by Anonymous

Calculus
A pilot wishes to reach an airport 350 Km due east from his present position. The wind is blowing from N25degreesE with a speed of 80 Km/h and the planes airspeed is 400 Km/h. What ground speed and what heading should the pilot steer to reach the airport? How many minutes will...
Tuesday, May 4, 2010 at 5:56pm by Ariza

calculus
Two roads intersect at an angle of 48º. A car and truck collide at the intersection, and then leave the scene of the accident. The car travels at 100 km h down one road, while the truck goes 80 km h down the other road. Fifteen minutes after the accident, a police helicopter ...
Thursday, April 15, 2010 at 6:35pm by lALA

physics
A car has a flywheel ( a diks of R=0.2m and uniformly distributed mass M=100kg) that can convert 25% of the rotational kinetic energy into translational kinetic energy. The mass of the car is 1000kg ( including flywheel). Suppose the car is at rest, and the flywheel has a ...
Monday, December 30, 2013 at 4:57pm by Al

AP physics
A car travels 35 km west and 75 km north. what distance did it travel?
Sunday, August 1, 2010 at 8:43pm by LISAA

Physics Help ASAP
A car horn is pitched at 520 Hz. The car travels along a straight road at a speed of 25 m/s. towards an observer walking at 2 m/. The speed of sound is 334 m/s. Calculate the frequency heard by the observer when: (a) the car is moving towards the observer
Thursday, July 25, 2013 at 4:07pm by Sher

Physics
Need Help with physics! Two cars drive on a straight highway. At time t = 0, car 1 passes mile marker 0 traveling due east with a speed of 17.0 m/s. At the same time, car 2 is 1.3 km east of mile marker 0 traveling at 30.0 m/s due west. Car 1 is speeding up with an ...
Thursday, October 4, 2012 at 5:48pm by Brandon

Two trains on separate tracks move toward one another. Train 1 has a speed of 125 km/h and train 2 a speed of 100.0 km/h. Train 2 blows its horn, emitting a frequency of 500 Hz. What is the frequency heard by the engineer on train 1? (Assume the speed of sound is 345 m/s.)
Friday, January 28, 2011 at 1:43pm by julie

physics
Sally travels by car from one city to another. She drives for 24.0 min at 63.0 km/h, 36.0 min at 45.0 km/h, and 44.0 min at 49.0 km/h, and she spends 13.0 min eating lunch and buying gas.
Saturday, September 19, 2009 at 11:24am by berha

physics
Perhaps your problem is with being forced to change dimensions. The initial speed of 40 km/h is 11.1 m/s Add 2.3 m/s^2*2.7s = 6.2 m/s (rounded off) to the initial velocity, and that leads to a final velocity of 17.3 m/s. The AVERAGE velocity during the acceleration interval is...
Friday, February 27, 2009 at 12:37pm by drwls

physics
In many countries, automatic number plate recognition is used to catch speeders. The system takes a time-stamped license plate photo at one location (like an on-ramp to a freeway), and then takes a second time-stamped photo at a second location a known distance from the first ...
Saturday, September 1, 2012 at 12:52pm by Natasha

physical science
Convert the weight W (in N) to the mass M (in kg). M = W/g Then convert the speed in km/h to m/s. V = 90 km/h = 25 m/s The momentum is M*V. The preferred units are km*m/s.
Sunday, June 12, 2011 at 5:56pm by drwls

chemistry
Zn(C2H3O2)2 = Zn(Ac)2 0.432 g Zn(Ac)2/mol mass = moles Zn(Ac)2 mols Ac^- = 2 x moles Zn(Ac)2 M Ac^- = mols Ac^-/L soln.
Wednesday, January 18, 2012 at 6:30pm by DrBob222

physics
During the first 18 minutes of a 1.0-hour trip, a car has an average speed of 11 m/s. What must the average speed of the car be during the last 42 minutes of the trip be if the car is to have an average speed of 21 m/s for the entire trip?
Sunday, January 30, 2011 at 8:02pm by thaokieu

physics
A 250 kg car starting from rest is pushed 30m. When the car reaches 30m, it’s traveling at a speed of 12m/s and it encounters 52N of friction. What is the acceleration of the car and what is the force of the push on the car?
Wednesday, December 1, 2010 at 11:46am by Alyssa

Physics
A 3600 kg open railroad car coasts along with a constant speed of 11.0 m/s on a level track. Snow begins to fall vertically and fills the car at a rate of 3.70 kg/min. Ignoring friction with the tracks, what is the speed of the car after 80.0 min?
Wednesday, November 10, 2010 at 1:47pm by Linda

Physics
A railroad car moves under a grain elevator at a constant speed of 3.70 m/s. Grain drops into the car at the rate of 580 kg/min. What is the magnitude of the force needed to keep the car moving at constant speed if friction is negligible? F = Ma -> R * V(rel)
Tuesday, May 22, 2012 at 11:36am by Dan

Physics
A car rounds a curve that is banked inward. The radius of curvature of the road is R = 109, the banking angle is θ = 25°, and the coefficient of static friction is μs = 0.24. Find the minimum speed that the car can have without slipping.
Tuesday, October 2, 2012 at 7:05pm by Find the maximum speed that the car can have witho

physics
An open train car, with a mass of 2070 kg, coasts along a horizontal track at the speed 2.31 m/s. The car passes under a loading chute and, as it does so, gravel falls vertically into it for 3.25 s at the rate of 491 kg/s. What is the car's speed after the loading is completed?
Monday, November 19, 2012 at 10:01pm by Alex

Physics
Your car can accelerate at 5m/^2 without a trailer. You add a trailer to your car that has 3 times the mass of your car. At what rate can your car (plus trailer) accelerate now? After accelerating the car travels at a constant speed of 30 m/s. What is the net force acting on it?
Sunday, September 23, 2012 at 5:01pm by Samantha

math
to save fuel on the 240 km trip to the cottage, the Nakamura family reduce their usual average speed by 20 km/h. this lengthens their journey by 1 hour. what is the slower average speed? pleassee help! thanks :)
Monday, March 21, 2011 at 10:12pm by dawn

physics
You set out to design a car that uses the energy stored in a flywheel consisting of a uniform 97-kg cylinder of radius R that has a maximum angular speed of 330 rev/s. The flywheel must deliver an average of 1.70 MJ of energy for each kilometer of distance. Find the smallest ...
Wednesday, November 7, 2012 at 9:35pm by Jack

physics
A car, moving along a straight stretch of highway, begins to accelerate at 0.0218 m/s 2 . It takes the car 86 s to cover 2 km. How fast was the car going when it ﬁrst began to accelerate? Answer in units of m/
Wednesday, September 28, 2011 at 9:40pm by bluh

Physics
9)A car, moving along a straight stretch of highway, begins to accelerate at 0.0153 m/s 2 . It takes the car 29.2 s to cover 1 km. How fast was the car going when it ﬁrst began to accelerate? Answer in units of m/s
Sunday, November 4, 2012 at 8:42pm by Savannah

physics
A compact car, mass 705 kg, is moving at 1.00 102 km/h toward the east. Sketch the moving car. Do this on paper. Your instructor may ask you to turn in this work.. (a) Find the magnitude and direction of its momentum. Draw an arrow on your sketch showing the momentum. kg · m/s...
Monday, December 6, 2010 at 8:07pm by max

physics
A compact car, mass 705 kg, is moving at 1.00 102 km/h toward the east. Sketch the moving car. Do this on paper. Your instructor may ask you to turn in this work.. (a) Find the magnitude and direction of its momentum. Draw an arrow on your sketch showing the momentum. kg · m/s...
Monday, December 6, 2010 at 8:07pm by max

Science
A car weights 1.30 X 10^4 N is initially moving at a speed of 40km/h when the brakes are applied and the car is brought to a stop in 15m. Assuming that the force that srops the car is constant. find a)magnitude of the force b)time required for the change in speed. If the ...
Sunday, November 12, 2006 at 10:16am by Ren

Physics
A mine car (mass 380 kg) rolls at a speed of 0.5 m/s on a horizontal track, as the drawing shows. A 150 kg chunk of coal has a speed of 0.80 m/s when it leaves the chute. Determine the velocity of the car/coal system after the coal has come to rest in the car.
Tuesday, April 1, 2008 at 4:25pm by Will

inter med algebre
these were extra credit quest to help grade but i could not do these i asked so many people there were stumped can who gets this ques can u do the whole promlem pleasw. Questin; Pick a car and finf its top speed . Assuming that your chosen carnreaches its top speed at the top ...
Monday, December 13, 2010 at 3:55am by Linda P*

physics
An 9000 test car travels 40.5 before stopping from an initial speed of 25.7 on dry horizontal pavement with its wheels locked. a)Make a free-body diagram of this car while it is slowing down. b) What external force causes it to slow down? c)Assuming constant acceleration, find...
Wednesday, February 6, 2013 at 2:30am by Leewillikers

physics
A car goes 10 km in 5 minutes when its average velocity is 80 km/hr. true or false
Sunday, August 26, 2012 at 3:40pm by jassi

physics
A car drives around a curve with radius 410 m at a speed of 39 m/s. The road is banked at 4.6°. The mass of the car is 1600 kg. (a) What is the frictional force on the car? (b) At what speed could you drive around this curve so that the force of friction is zero?
Thursday, March 25, 2010 at 4:00pm by Anonymous

physics
The driver of a car going 90.0 km/h suddenly sees the lights of a barrier 35.0 m ahead. It takes the driver 0.75 s to apply the brakes, and the average acceleration during braking is -10.0 m/s2. (b) What is the maximum speed at which the car could be moving and not hit the ...
Friday, November 26, 2010 at 1:46am by javane

chemistry
CH3COOH we will call HAc 100 mL x 0.017 = 1.7 millimoles HAc 10 mL x 0.026 = 0.25 mmoles NaOH. ...........HAc + NaOH ==> NaAx + H2O initial....1.7....25.......0......0 change....-.25..-0.25......0.25 equil.....1.45.....0........0.25 concn acid = 1.45 mmoles/(100+10)mL=? ...
Wednesday, October 12, 2011 at 11:20pm by DrBob222

physics
A car moving at 50 km/h skids 15 m with locked brakes. Show that a car moving at 150 km/h will skid 135 m with locked brakes. (Hint: The force doing work during the skidding is the same for both speeds. Use the work–energy theorem.)
Monday, January 6, 2014 at 6:28pm by jeremy steadman

physics
to qualify for a race, a car must average 350 km/hr for four laps. If a driver averages 285 km/hr for the first two laps, what average speed must be achieved for the final two laps in order to qualify?
Tuesday, September 25, 2012 at 8:54pm by mary otto

Physics
A roller-coaster car speeds down a hill past point A where R1 = 10.4 m and then rolls up a hill past point B where R2 = 15.6 m, as shown below. R1 and 2 are radii (a) The car has a speed of 21.0 m/s at point A. if the track exerts a normal force on the car of 2.05 multiplied ...
Thursday, November 1, 2012 at 10:09pm by Angela

Physics
If the force of friction is constant, prove that the stopping distance of a car on a level road varies directly with the square of the initial speed.
Wednesday, October 6, 2010 at 6:15am by Shaila

physics
Two cars are traveling at the same constant speed v. Car A is moving along a straight section of the road, while B is rounding a circular turn. Which statement is true about the acceleration of the cars? a.) acceleration of both cars is zero b.) car A is accelerating but car B...
Tuesday, October 19, 2010 at 2:21am by jo

physics
A car is traveling at 25m/s when an accident occurs. The car decelerates 300m/s^2 but the passenger does not slow down because he is not wearing a seatbelt. a) Supposing the distance between the passenger and the dashboard is initially 0.50m, what will be the speed of the car ...
Sunday, February 10, 2013 at 11:58pm by rob

Maths
The braking distance of a car is directly proportional to te square of it's speed. When the speed is p metres per second, the braking distance is 6m. When the speed is increased by 300%, find (a) an expression for speed of the car (b) the braking distance (c) the % increase in...
Friday, October 21, 2011 at 6:48am by StuartKess

physics
Two cars start from rest at the same location and at the same instant and race along a straight track. Car A accelerates at 6.6 fps2 to a speed of 90 mph and then runs at this constant speed. Car B accelerates at 4.4 fps2 to a speed of 96 mph and then runs a a constant speed...
Saturday, January 22, 2011 at 2:06pm by David

physics
A car is behind a truck going 23.0 m/s on the highway. The driver looks for an opportunity to pass, guessing that his car can accelerate at 2.2 m/s2, and he gauges that he has to cover the 24.0 m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more ...
Sunday, May 13, 2007 at 7:53pm by micole

College Physics
A 3400 kg open railroad car coasts along with a constant speed of 7.50 m/s on a level track. Snow begins to fall vertically and fills the car at a rate of 5.10 kg/min.Ignoring friction with the tracks, what is the speed of the car after 85.0 min ?
Sunday, March 14, 2010 at 11:04pm by Sandy

Physics
The 2500 kg cable car shown in the figure below descends a 200 m high hill. In addition to its brakes, the cable car controls its speed by pulling an 1200 kg counterweight up the other side of the hill. The rolling friction of both the cable car and the counterweight are ...
Wednesday, November 3, 2010 at 8:56am by Laila

physics
A mechanic pushes a 2.50 x 10^3 kg car from the rest to a speed of v, doing 5000J of work in the process. During this time, the car moves 25.0 m. Neglecting friction between car and road, find (a) v and (b) the horizontal force exerted on the car.
Monday, October 22, 2007 at 10:42pm by Anonymous

physics-5
A pilot begins a race at a speed of 755.0 km/h and accelerates at a constant uniform rate for 63.21 s. The pilot cross the finish line with a speed of 777.0 km/h. From this data, calculate the length of the course.
Wednesday, September 16, 2009 at 10:28pm by NoNo100

Algebra
Manuel has a boat that can move at a speed of 30 kn/h in still water. He rides 280 km downstream in a river in the same time it takes to ride 70 km upstream. What is the speed of the river?
Wednesday, November 3, 2010 at 10:05pm by Dusty

Describe how the instantaneous speed of a car changes when the car is moving with constant speed , speeding up, and slowing down please answer as soon as possible
Sunday, March 28, 2010 at 4:51pm by me

physics
Two cars, A and B, are traveling in the same direction, although car A is 174 m behind car B. The speed of A is 25.6 m/s, and the speed of B is 18.6 m/s. How much time does it take for A to catch B?
Saturday, October 16, 2010 at 1:34pm by megan

Physics
Each tire on a car has a radius of 0.330 m and is rotating with an angular speed of 19.5 revolutions/s. Find the linear speed v of the car, assuming that the tires are not slipping against the ground.
Monday, October 24, 2011 at 12:41am by Jasmin

physics
Two cars, A and B, are traveling in the same direction, although car A is 204 m behind car B. The speed of A is 22.9 m/s, and the speed of B is 18.6 m/s. How much time does it take for A to catch B?
Sunday, September 22, 2013 at 3:28pm by help please

Algebra
A tcar left Purm and traveled west at 70 km/h. Two hours later another car left purm and traveled east at 90km/h. How many hours had the first car traveled when they were 1420 km apart?
Monday, October 29, 2007 at 5:05pm by Tom

Algebra! Help needed!
I count three problems. #2. The bus starts out 64 x 1.5 = 96 km ahead and after the car starts, the distance between them decreases at a rate of 88-64 = 24 km/h. Divide 96 km by 24 km/h for the answer, in hours. Try the others yourself and someone will gladly critique your work.
Thursday, November 20, 2008 at 5:19pm by drwls

physics
a 17 kg car travels in a flat circle . At a certain instant the velocity of the car is 18m/s west and the total acceleration of the car is 2m/s^2 at 51 degrees north west. what is its radius? answer in units of km.
Friday, November 19, 2010 at 12:02am by maira

Mths problem sums
Mr thiru took 1h to drive frm A to B at an average speed of 60Km/h. after taking a rest, he travelled 60km to reach C. His overall average speed was 36km/h. If he left A at 10.50a.m. at What time did he reach C From A to B he travelled 60 km. From B to C he also travelled 60 ...
Wednesday, September 20, 2006 at 4:22am by Kitty

Physics
A car with 60 cm diameter tires is traveling at a constant speed of 100 km/hr. What is the angular velocity of the tires in rad/s?
Wednesday, November 14, 2012 at 8:50am by Bryan

Physics
A car with 60 cm diameter tires is traveling at a constant speed of 100 km/hr. What is the angular velocity of the tires in rad/s?
Wednesday, November 14, 2012 at 4:56pm by Bryan

Physics
An 11,000 N test car travels 44.5 m before stopping from an initial speed of 28.7 m/s on dry horizontal pavement with its wheels locked. (a) make a free body diagram of this car while its slowing down. (b) what external force causes it to slow down. (c) Assuming constant ...
Tuesday, October 6, 2009 at 12:24pm by SaraH

Physics
A curve of radius 40 m is banked so that a 1070 kg car traveling at 60 km/h can round it even if the road is so icy that the coeﬃcient of static friction is approximately zero. The acceleration of gravity is 9.81 m/s a)Find the minimum speed at which a car can travel ...
Wednesday, March 2, 2011 at 11:22am by Johnnie

science
If you drive a car from Milwaukee to Chicago in 90 mins what is the velocity in km in 1 hour use 150 km as your distance ?
Monday, August 29, 2011 at 8:50pm by brianna f

physics
The Graph above shows the speed of a car traveling in a straight line as a function of time. The car accelerates uniformly and reaches a speed Vb of 4.00 m/s in 8.00 seconds. Calculate the distance traveled by the car from a time of 1.20 to 4.40 seconds.
Sunday, September 8, 2013 at 4:22pm by Karen

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?
Tuesday, October 22, 2013 at 5:53am by McKenna Louise

phisecs
final displacement is 8 km in 3 hrs, so v = 8/3 km/hr North His speed, on the other hand, is non-directional, so it is just distance covered = 18/3 = 6 km/hr
Thursday, February 20, 2014 at 11:39pm by Steve

More Physics
You have to use three formulas for this one, I'm afraid. First you need to find out how long it takes for the car to decelerate during those 79m. Then you have to figure the acceleration, knowing the speed and the time. And finally you have to translate that acceleration into ...
Wednesday, December 5, 2012 at 7:40pm by naomi

physic
1. Velocity = Displacement / time Displacement = Final position - initial position Note that displacement does not have to equal distance if the bus travels in a zig-zag route. 2. Speed = distance / time Total distance = 1600 m. 230 km/h = 230000 m/3600 s = 63.889 m/s 250 km/h...
Wednesday, October 14, 2009 at 6:28pm by MathMate

physics
A mine car, whose mass is 590 kg, rolls at a speed of 0.5 m/s on a horizontal track, as the drawing shows. A 150 kg chunk of coal has a speed of 0.95 m/s when it leaves the chute. Determine the velocity of the car/coal system after the coal has come to rest in the car.
Tuesday, October 14, 2008 at 9:29pm by kb

physics
A mine car (mass = 452 kg) rolls at a speed of 0.356 m/s on a horizontal track, as the drawing shows. A 179-kg chunk of coal has a speed of 0.863 m/s when it leaves the chute. Determine the velocity of the car/coal system after the coal has come to rest in the car.
Sunday, November 15, 2009 at 6:43pm by sarah

physics
A man on the top of a 40 meter tower directly overhead the road is watching a car moving on a straight road. The car speed makes an angular velocity with respect to the observer in a constant speed of 0.16radian/sec. Find the linear velocity of the car when its position is ...
Wednesday, July 18, 2012 at 2:51am by pam

measurement
A trailer driver left Miami at 15:45 and arrived at his destination 637.5 km away at 02:15 the next day a. How long did the journey take? b. What was his average speed in km/h c. What was his speed in ms^-1?
Wednesday, May 9, 2012 at 10:35pm by Lindsay

chemistry-science
a) pH = pKa + [(base)/(acid)] will get the pH at the beginning. b)HAc + OH^- ==> H2O + Ac^- initial: HAc = 500 x 0.2 M = 100 millimoles. OH^- = 0 Ac^- = 500 x 0.3M = 150 millimoles. change: OH^- = 20 mL x 1 M = 20 millimoles added HAc = 100-20 Ac^- = 150 + 20 final: HAc = ...
Friday, April 30, 2010 at 3:22am by DrBob222

MATH
Well, obviously the speed of the plane must be greater than the speed of the wind, so in x-y = 112 x must be the plane's speed and y the wind's speed so sub y = 23 into x+y = 158 x+23=158 x = 155
Monday, August 27, 2012 at 8:40am by Reiny

Math
what value of m will make 4x-7y=5 and 9x+my=3 parallel? a car leaves town A at 10:00 a.m. and travels at a constant speed of 40 kph towards a town B. After 30 minutes, a bus leaves town A and travels towards town B at a constant speed of 56 kph. at what time will the bus catch...
Sunday, September 22, 2013 at 5:50am by Riza

Physics
A ball is thrown horizontally from a height of 16.01 m and hits the ground with a speed that is 5.0 times its initial speed. What was the initial speed? This question really boggles my brain. I have no idea how to solve this, given only the height. Could someone please steer ...
Sunday, November 4, 2007 at 8:32am by Lindsay

physics
A sailboat is sailing north on a lake parallel to the shore with a speed of 12 kilometers per hour (km/hr). If a man walking south along the shore has a speed of 4 km/hr, what is the northerly speed of the sailboat relative to the man?
Thursday, March 24, 2011 at 8:27pm by jill

Science
#1. Kilometers per hour describes the speed of an object. ture false **** #2. Which of the following reference points would allow you to observe the speed of a car that you are traveling in? a) an airplane flying across the sky b) a car traveling next to you at the same speed ...
Thursday, February 27, 2014 at 7:15pm by Mindy

physics
A 1200 kg car on a horizontal surface starts from rest and accelerates uniformly to 72 km/h in 20.0 s. Friction exets an average force of 450 N on the car during this time. a) what is the net work done on the car b) how far does the car move during this acceleration now i ...
Wednesday, September 28, 2011 at 9:55pm by jj

physics
Your physics teacher drives an ideal frictionless car of mass 1000 kg which coasts along the level road to his home at a constant speed of 48 km/h with the engine turned off. It then coasts 40 m up his sloping driveway and comes to rest at the top without any braking required...
Saturday, November 3, 2012 at 2:58pm by Jen

Math
The speed limit on a highway is 65 mi/hr. What is this speed in km/hr? Is the correct answer 104 km/hr?
Saturday, February 25, 2012 at 10:39am by Mandi

physics
A curve of radius 20 m is banked so that a 970 kg car traveling at 50 km/h can round it even if the road is so icy that the coeﬃcient of static friction is approximately zero. The acceleration of gravity is 9.81 m/s^2 Find the minimum speed at which a car can travel ...
Thursday, November 1, 2012 at 12:22am by JoAnna

Maths
At 9.30 a.m., a car left town X for town Y at a speed of 60km/h for the whole journey. At 11 a.m., a lorry started from town Y and travelled towards town X. The speed of the lorry remained the same until it passed the car at 12.30 p.m. The lorry passed the car at midpoint ...
Monday, December 30, 2013 at 6:09pm by Sarah

Science
A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s, how much chemical energy would be needed to move the car a distance of 450 m at this ...
Wednesday, July 18, 2012 at 7:11pm by Bob

Science
A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s, how much chemical energy would be needed to move the car a distance of 450 m at this ...
Wednesday, July 18, 2012 at 8:07pm by Rob

PHYSICS
Time = Distance/Speed If speed is in km/h and Distance in km, the answer will be in hours.
Wednesday, September 5, 2007 at 9:50pm by drwls

Physics- science
An automobile with an initial speed of 4.82 m/s accelerates uniformly at the rate of 2.2 m/s2. Find the displacement of the car after 5.9 s. Answer in units of m
Tuesday, September 13, 2011 at 7:44pm by Destiny

physics
A toy car with a mass of 120 g moves to the right with a speed of 0.56 m/s. A small child drops a 25.0-g piece of clay onto the car. The clay sticks to the car and the car continues to the right. What is the change in speed of the car? Consider the frictional force between the...
Sunday, February 28, 2010 at 2:35pm by Angie

ap chemistry
Use the HH equation and solve for Ac. pH = pKa + log (Ac/HAc) 5.027 = 4.744 + log Ac/0.5 Now convert M Ac to grams.
Tuesday, February 4, 2014 at 7:00pm by DrBob222

Physics
A car traveling 56 km/h is 22.0 m from a barrier when the driver slams on the brakes. The car hits the barrier 2.15 s later. (a) Assuming constant acceleration, what was the magnitude of the car's acceleration before impact? _______ m/s2 (b) How fast was the car traveling at ...
Wednesday, September 19, 2012 at 2:43pm by arcos15

Physics
A car traveling 56 km/h is 22.0 m from a barrier when the driver slams on the brakes. The car hits the barrier 2.15 s later. (a) Assuming constant acceleration, what was the magnitude of the car's acceleration before impact? _______ m/s2 (b) How fast was the car traveling at ...
Wednesday, September 19, 2012 at 10:08pm by arcos15

Physics
ok,ok,ok....lad listen up lets see how ya did here... THESE ARE THE CORRECT ANSWERS... 1a) 85 km/hr = 23.61 m/s (HINT: from km/hr to m/s just divide by 3.6) 1b) d = vt = (23.61)(8) = 188.88 m 1c) t = d/v = (2000)/(23.61) = 84.7 s 1d) v = d/t = (140)/(1.83) = 76.5 km/hr (HINT: ...
Wednesday, June 5, 2013 at 9:20pm by herp_derp

Physics
An open train car, with a mass of 2150 kg, coasts along a horizontal track at the speed 2.29 m/s. The car passes under a loading chute and, as it does so, gravel falls vertically into it for 2.67 s at the rate of 441 kg/s. What is the car's speed after the loading is ...
Monday, November 19, 2012 at 4:12pm by Kyle

physics
A 64.2-kg skier coasts up a snow-covered hill that makes an angle of 23.8° with the horizontal. The initial speed of the skier is 7.18 m/s. After coasting 1.96 m up the slope, the skier has a speed of 3.13 m/s. Calculate the work done by the kinetic frictional force that acts ...
Saturday, November 26, 2011 at 6:49pm by dave

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