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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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We claim that momentum is conserved. Yet most moving objects eventually slow down and stop. Explain.
Suppose that in Example 7–14 (Fig. 7–28), \({{\bf{m}}_{{\bf{II}}}}{\bf{ = 3}}{{\bf{m}}_{\bf{I}}}\).
(a) Where then would \({{\bf{m}}_{{\bf{II}}}}\) land?
(b) What if \({{\bf{m}}_{\bf{I}}}{\bf{ = 3}}{{\bf{m}}_{{\bf{II}}}}\)?
A radioactive nucleus at rest decays into a second nucleus, an electron, and a neutrino. The electron and neutrino are emitted at right angles and have momenta of \(9.6 \times {10^{ - 23}}\;{\rm{kg}} \cdot {\rm{m/s}}\) and \(6.2 \times {10^{ - 23}}\;{\rm{kg}} \cdot {\rm{m/s}}\), respectively. Determine the magnitude and the direction of the momentum of the second (recoiling) nucleus.
A boy stands on the back of a rowboat and dives into the water. What happens to the boat as he leaves it? Explain.
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