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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)?
A graph of v(t) is shown for a world-class track sprinter in a\({\bf{100}} - {\bf{m}}\)race. (See Figure 2.67). (a) What is his average velocity for the first 4 s? (b) What is his instantaneous velocity at\(t = {\rm{ }}{\bf{5}}{\rm{ }}{\bf{s}}\)? (c) What is his average acceleration between 0 and 4 s? (d) What is his time for the race?
(a) Calculate Earth’s average speed relative to the Sun.
(b) What is its average velocity over a period of one year?
A basketball referee tosses the ball straight up for the starting tip-off. At what velocity must a basketball player leave the ground to rise above the floor in an attempt to get the ball?
A swan on a lake gets airborne by flapping its wings and running on top of the water.
(a) If the swan must reach a velocity of6.00 m/s to take off and it accelerates from rest at an average rate of 0.350 m/s2, how far will it travel before becoming airborne?
(b) How long does this take?
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