#387 A 900 kg roller coaster car starts at point

A 900 kg roller coaster car starts at point - Physics

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Free Chegg Question

A 900 kg roller coaster car starts at point A, then travels 125 ft at 40.0° below the horizontal to point B.

(a) Taking point B to be the level where the gravitational potential energy of the car–Earth system is zero, what is the potential energy (in J) of the system when the car is at points A and B, and the change in potential energy (in J) as the coaster moves between these points?

b) Repeat part (a), setting the zero configuration with the car at point A.

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Free Chegg Answer

d = 125 ft = 38.1 m

vertical height

h = d sin 40 = 24.49 m

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a) Ua = mgh = 900* 9.8* 24.49 = 2.16*10^5 J

b) Ub = 0 J

c) dU = Ub - Ua = - 2.16*10^5 J

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d) Ua = 0 J

e) Ub = - mg h = - 2.16*10^5 J

f) dU = 2.16*10^5 J

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