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March 29, 2015

Homework Help: physics

Posted by Donald on Monday, November 12, 2012 at 5:25am.

One of the new events in the 2002 Winter Olympics was the sport of skeleton (see photo). Starting at the top of a steep, icy track, a rider jumps onto a sled (known as a skeleton) and proceeds-belly down and head first-to slide down the track. The track has fifteen turns and drops 100 m in elevation from top to bottom.

(a) In the absence of nonconservative forces, such as friction and air resistance, what would be the speed of a rider at the bottom of the track? Assume that the speed of the rider at the beginning of the run is relatively small and can be ignored.
m/s

(b) In reality, the best riders reach the bottom with a speed of 35.8 m/s (about 80 mi/h). How much work is done on an 84.4-kg rider and skeleton by nonconservative forces?

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