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May 25, 2015

Homework Help: Physics

Posted by Tammy on Wednesday, November 14, 2007 at 8:02pm.

A roller coaster car of mass 1000kg is riding along a track from point A to point C. (point A is 75m high, B is 50m high and C is 100m high, so that there are a total of three hills.) the final velocity at point C is 10m/s

a) Assume no friction what is the speed of the car at the top of hill A?

intial = final
1/2mv_a^2 +mgh_a = 1/2mv_c^2 + mgh_c
1/2V_a^2 + 750 = 1050
V_a = 24.5 m/s

b) what is the max speed the car can achieve along the track?

What would be the equation for this part of the problem?

c) assume the car starts with the same speed as a) and there is friction present. The car does 50000J of work while the car moves from A to C, will the car still be able to ascend to the top of hill C? At what speed is the car at the top of C?

W= change in KE
and I got V_c = 26.5m/s

d) If the distance along the track from point A to point C is 200m what is the average magnitude of the force of friction between the track and the car?

I don't know how to find this part of the problem can you please help me?

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