Question
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Re-work the above problem, with the braking force kicking in at point B rather than at the horizontal track.A 5 gram bullet is moving at 400 m/s. It passes through a 2" thick piece of wood and comes out moving at 300 m/s. How much heat energy could have been generated? What was the average force on the bullet?What is the KE of a 200 lb man on a 35 lb bicycle moving at 20 mph? If it took him 10 seconds to get to 20 mph, what was his power output? According to the 1967 Journal of Experimental Biology paper "The Jump of the Flea: A Study of the energetics and a model of the mechanism" by 3ennet-Clark and Lucey, when a flea (mass 0.45 mg) jumps it accelerates from 0 to 1 m/s in approximately 0.85 ms. Determine its acceleration and power.
Explanation / Answer
