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Question
A sprinter with a mass of 79 kg reaches a speed of 7 m/s during a race. Find the sprinter’s linear momentum (in kg · m/s). (Enter the magnitude.)
Question
A spring is stretched by an initial amount from its relaxed state. If the spring is then stretched by nine times that amount from its relaxed state, by what factor does the amount of mechanical energy stored in the spring change?
PEfinal
_______ =
PEinitial
Question
A 7,800-kg truck runs into the rear of a 1,000-kg car that was stationary. The truck and car are locked together after the collision and move with speed 5 m/s. Compute how much kinetic energy was “lost” in this inelastic collision.
Question
A 35 kg child uses a pogo stick to bounce up and down. The spring constant, k, of the toy equals 8,800 N/m.
a) By how much would the spring be compressed by the child if she simply balanced herself vertically on the pedals of the stick? (Give your answer in cm.)
b) How much energy (in J) is stored in the spring under this circumstance?
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