A 1500 kg car is traveling 30 m/s along a horizontal road when the brakes are applied. The car skids to a stop in 4 s. How much kinetic energy ( in J) does the car lose in this time ?
2006-11-21 13:08:59 · 10 answers · asked by Anonymous in Cars & Transportation ➔ Other - Cars & Transportation
Physics Question ?? HELP
2006-11-21 13:12:53 · update #1
No idea. I have always regretted not taking physics.
2006-11-21 13:10:59 · answer #1 · answered by ndtaya 6 · 0⤊ 2⤋
If the car comes to a complete stop, then it should have lost all of its kinetic energy.
So as the car was moving, it had
1/2 m v^2
(1/2)(1500)(30)^2 = 675,000 J
The time seems to be in there just to throw you off, if the question is asking how much KE the car lost (it ends up with none).
2006-11-21 13:13:00 · answer #2 · answered by Dumblydore 3 · 3⤊ 0⤋
Kinetic energy is the energy that a body possesses as a result of its motion. It is formally defined as the work needed to accelerate a body from rest to its current velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. Negative work of the same magnitude would be required to return the body to a state of rest from that velocity.
2006-11-21 13:24:30 · answer #3 · answered by ernest 1 · 0⤊ 0⤋
surely thermal ability is kinetic temperature is the degree of the established kinetic ability of the debris in a pattern yet there is also ability ability it really is ability linked with position or some subject an merchandise sitting on a table has ability ability with respect to the floor yet there is not any action if the article falls, then that ability ability is switched over to kinetic chemical bonds have ability ability it really is each and every from time to time switched over to kinetic (mostly contained in the kind of thermal ability) as even as a gas which includes methane is burned the debris contained in the nucleus of an atom have ability ability which will properly be switched over to kinetic (in various of circumstances thermal) ability even as the debris are rearranged as in fission or fusion of nuclei
2016-11-29 08:45:11 · answer #4 · answered by ? 4 · 0⤊ 0⤋
KE=1/2mv^2
KE=1/2(1500)(30^2)
KE=675000J
its asking how much KE is lost, so if its at stop then it lost all its energy so KE=0 at the end of the 4s
i think the time is there to get people confused
2006-11-21 13:17:50 · answer #5 · answered by Kevin C 1 · 1⤊ 0⤋
Not sure if this is in joules or not
Ke=W*V2/64.4
Ke=3306.93*98.43 squared/64.4
Ke=3306.93*9688.4649/64.4
Ke=32039075.23/64.4
Ke=497501.1682
The amount of time is meaningless because the vehicle skidded to a stop and there fore lost all of its kinetic energy during the four seconds.
Note: I had to change m/s into f/s and kg into lbs.
2006-11-21 23:56:53 · answer #6 · answered by crashguy351 2 · 0⤊ 0⤋
I think it's(1500 x 30)-4 but I'm not sure.
2006-11-21 13:16:27 · answer #7 · answered by Anonymous · 0⤊ 1⤋
Isn't that potential energy? I have no idea, my brother is learning that but he doesn't learn during class. Sorry no idea, ask in askjeeves.com?
2006-11-21 13:11:07 · answer #8 · answered by Anonymous · 0⤊ 1⤋
geeze just ask your teacher if you are having problems with your homework.....
2006-11-21 13:11:38 · answer #9 · answered by Kenneth S 5 · 0⤊ 1⤋
I HATE PHYSICS!!!!!!!!!!!!!!
2006-11-21 13:09:52 · answer #10 · answered by rogue chedder 4 · 0⤊ 1⤋