HW 10 -m In the sport of belly down and head first. The track has sixteen s to s

Question

HW 10 -m In the sport of belly down and head first. The track has sixteen s to slide down an icy track, turns and drops 78 m in elevation from top to bottom (0 Frank Gunn/AP/Wide World Photos) (a) In the absence of at the bottom of the track? Assume that the speed at the beginning of the run is relatively small and can be gnored. 39.1 forces, such as friction and air resistance, what would be the speed of a rider m/s (b) In reality, the best riders reach the bottom with a speed of 35.8 m/s (about 91 mi/h). How much work is done on a rider and his sled (assuming a total mass of 80.5-kg) by nonconservative forces? 6

Explanation / Answer

(B) Applying work - energy theorem,

work done by gravity + work done by force = change in KE

(80.5 x 9.8 x 78) + W = 80.5(35.8^2 - 0) / 2

W = - 9948 J ......Ans

{ include minus sign because work done is negative}

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