Chapter 7: Q23Q (page 170)
How can a rocket change direction when it is far out in space and essentially in a vacuum?
When a rocket wants to change its direction, it ejects some gas opposite to the desired direction.
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A ball of mass 0.440 kg moving east (+x direction) with a speed of \({\bf{3}}{\bf{.80}}\;{{\bf{m}} \mathord{\left/{\vphantom {{\bf{m}} {\bf{s}}}} \right.\\} {\bf{s}}}\) collides head-on with a 0.220-kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each ball after the collision?
An atomic nucleus of mass m traveling with speed v collides elastically with a target particle of mass 2m (initially at rest) and is scattered at 90°.
(a) At what angle does the target particle move after the collision?
(b) What are the final speeds of the two particles?
(c) What fraction of the initial kinetic energy is transferred to the target particle?
An object at rest is suddenly broken apart into two fragments by an explosion. One fragment acquires twice the kinetic energy of the other. What is the ratio of their masses?
(I) What is the magnitude of the momentum of a 28-g sparrow flying with a speed of 8.4 m/s?
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