A 900 kg roller coaster car starts from rest at point A. rolls down the track, goes around a loop (points B and C) and then flies off the inclined part of the track (point D),
Figure 2.
The dimensions are: H =80 m.
r= 15m, h=10m and theta =9.30°

Calculate the
(a) gravitational potential energy at point A.

(b) velocity at point C, if the work done to move the roller coaster from point B to C is 264870 J.

c) distance of the car land (in the horizontal direction) from point D if given the
velocity at point D is 37.06 m/s

I

This problem has been solved! see the answera non-uniform fire escape ladder is 6.0m long whenextended to the icy alley below. it is held at the top by africtionless pivot, and there is neglibible frictional force fromthe icy surface at the bottom. the ladder weighs 250n, and it'scenter of gravity is 2.0m along the ladder from the bottom. amother and child of total weight 750n are on the ladder 1.5m fromthe pivot. the ladder makes an angle θ with the horizontal.find the magnitude and direction ofa) the force exerted by the icy alley on the ladderb) the force exerted by the ladder on the pivotc) do your answers in part a and b depend on the angle?

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