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Chapter 5: Problem 25
A hammerhead of mass \(m=2.00 \mathrm{~kg}\) is allowed to fall onto a nail from a height \(h=0.400 \mathrm{~m} .\) Calculate the maximum amount of work it could do on the nail.
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A ski jumper glides down a \(30.0^{\circ}\) slope for \(80.0 \mathrm{ft}\) before taking off from a negligibly short horizontal ramp. If the jumper's takeoff speed is \(45.0 \mathrm{ft} / \mathrm{s}\), what is the coefficient of kinetic friction between skis and slope? Would the value of the coefficient of friction be different if expressed in SI units? If yes, by how much would it differ?
Which of the following is a correct unit of power? a) \(\mathrm{kg} \mathrm{m} / \mathrm{s}^{2}\) c) J e) \(W\) b) \(N\) d) \(\mathrm{m} / \mathrm{s}^{2}\)
A skydiver is subject to two forces: gravity and air resistance. Falling vertically, she reaches a constant terminal speed at some time after jumping from a plane. Since she is moving at a constant velocity from that time until her chute opens, we conclude from the work-kinetic energy theorem that, over that time interval, a) the work done by gravity is zero. b) the work done by air resistance is zero. c) the work done by gravity equals the negative of the work done by air resistance. d) the work done by gravity equals the work done by air resistance. e) her kinetic energy increases.
A car of mass \(1214.5 \mathrm{~kg}\) is moving at a speed of \(62.5 \mathrm{mph}\) when it misses a curve in the road and hits a bridge piling. If the car comes to rest in \(0.236 \mathrm{~s}\), how much average power (in watts) is expended in this interval?
The damage done by a projectile on impact is correlated with its kinetic energy. Calculate and compare the kinetic energies of these three projectiles: a) a \(10.0 \mathrm{~kg}\) stone at \(30.0 \mathrm{~m} / \mathrm{s}\) b) a \(100.0 \mathrm{~g}\) baseball at \(60.0 \mathrm{~m} / \mathrm{s}\) c) a \(20.0 \mathrm{~g}\) bullet at \(300 . \mathrm{m} / \mathrm{s}\)
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