Chapter 7: Q3Q (page 170)
When a person jumps from a tree to the ground, what happens to the momentum of the person upon striking the ground?
The momentum of the person upon striking the ground will become zero.
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Three cubes, of side \({l_ \circ }\), \(2{l_ \circ }\), and \(3{l_ \circ }\), are placed next to one another (in contact) with their centers along a straight line as shown in Fig. 7–38. What is the position, along this line, of the CM of this system? Assume the cubes are made of the same uniform material.
FIGURE 7-38
Problem 52.
A block of mass\(m = 2.50\;{\rm{kg}}\)slides down a 30.0° incline which is 3.60 m high. At the bottom, it strikes a block of mass\(M = 7.00\;{\rm{kg}}\)which is at rest on a horizontal surface, Fig. 7–47. (Assume a smooth transition at the bottom of the incline.) If the collision is elastic, and friction can be ignored, determine (a) the speeds of the two blocks after the collision, and (b) how far back up the incline the smaller mass will go.
At a hydroelectric power plant, water is directed at high speed against turbine blades on an axle that turns an electric generator. For maximum power generation, should the turbine blades be designed so that the water is brought to a dead stop, or so that the water rebounds?
(b) the change in momentum of each
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