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Chapter 7: Q66P (page 175)
If a car of mass 1200kg is moving along a highway at 120 km/h, what is the car’s kinetic energy as determined by someone standing alongside the highway?
The car’s kinetic energy (K.E) as determined by someone standing alongside the highway is
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A fully loaded, slow-moving freight elevator has a cab with a total mass of1200 kg, which is required to travel upward 54 m in 3.0 min , starting and ending at rest. The elevator’s counterweight has a mass of only 950 kg, and so the elevator motor must help. What average power is required of the force the motor exerts on the cab via the cable?
Figure 7-21ashows four situations in which a horizontal force acts on the same block, which is initially at rest. The force magnitudes are . The horizontal component of the block’s velocity is shown in figure 7-21bfor the four situations. (a) Which plot in figure 7-21b best corresponds to which force in fig. 7-21a? (b) Which plot in figure 7-21c (for kinetic energy K versus time t) best corresponds to which plot in fig. 7-21b ?
A ice block floating in a river is pushed through a displacement along a straight embankment by rushing water, which exerts a force data-custom-editor="chemistry" on the block. How much work does the force do on the block during the displacement?
The graphs in give the x-component of force acting on a particle moving along an x-axis. Rank them according to the work done by the force on the particle from to , from most positive work first to most negative work last.
An explosion at ground level leaves a crater with a diameter that is proportional to the energy of the explosion raised to the power; an explosion of 1 megaton of TNT leaves a crater with a 1 km diameter. Below Lake Huron in Michigan there appears to be an ancient impact crater with a 50 km diameter. What was the kinetic energy associated with that impact, in terms of (a) megatons of TNT (1 megaton yields ) and (b) Hiroshima bomb equivalents (13kilotons of TNT each)? (Ancient meteorite or comet impacts may have significantly altered the climate, killing off the dinosaurs and other life-forms.)
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