Work, energy, impulse, and momentum
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A 464-kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing 195000 J of work on the balloon in the process. At what height above the surface of the earth does the balloon have a speed of 8.94 m/s?
A person is making homemade ice cream. She exerts a force of magnitude 25.5 N on the free end of the crank handle, and this end moves in a circular path of radius 0.293 m. The force is always applied parallel to the motion of the handle. If the handle is turned once every 1.22 s, what is the average power being expended?
Two friends, Al and Jo, have a combined mass of 149 kg. At an ice skating rink they stand close together on skates, at rest and facing each other, with a compressed spring between them. The spring is kept from pushing them apart, because they are holding each other. When they release their arms, Al moves off in one direction at a speed of 0.719 m/s, while Jo moves off in the opposite direction at a speed of 1.37 m/s. Assuming that friction is negligible, find Al's mass.
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Solution Summary
This solution involves calculating average power and mass.
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