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Chapter 2: Q7PE (page 82)
The North American and European continents are moving apart at a rate of about . At this rate how long will it take them to drift farther apart than they are at present?
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A bullet in a gun is accelerated from the firing chamber to the end of the barrel at an average rate of\({\bf{6}}{\bf{.20 \times 1}}{{\bf{0}}^{\bf{5}}}\;{\bf{m/}}{{\bf{s}}^{\bf{2}}}\)for\({\bf{8}}{\bf{.10 \times 1}}{{\bf{0}}^{{\bf{ - 4}}}}\;{\bf{s}}\). What is its muzzle velocity (that is, its final velocity)?
An unwary football player collides with a padded goalpost while running at a velocity of7.50 m/s and comes to a full stop after compressing the padding and his body 0.350.
(a) What is his deceleration?
(b) How long does the collision last?
Tidal friction is slowing the rotation of the Earth. As a result, the orbit of the Moon is increasing in radius at a rate of approximately. Assuming this to be a constant rate, how many years will pass before the radius of the Moon鈥檚 orbit increases by ?
a) Explain how you can use the graph of position versus time in Figure 2.54 to describe the change in velocity over time.
Identify
(b) the time ( ta, tb , tc , td , or te ) at which the instantaneous velocity is greatest,
(c) the time at which it is zero, and
(d) the time at which it is negative.
Figure 2.54
An object that is thrown straight up falls back to Earth. This is one-dimensional motion.
(a) When is its velocity zero?
(b) Does its velocity change direction?
(c) Does the acceleration due to gravity have the same sign on the way up as on the way down?
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