You are in distant space. A giant boulder, many times larger than you, is at rest in front of you. You tap the boulder lightly with a small hammer. What does the boulder do?
A) It accelerates during the tap, up to a slow speed slower than walking speed, then keeps moving at that speed.
B) It accelerates both during and after the tap.
C) It accelerates during the tap, up to a high speed faster than a fast-moving car, then keeps moving at that speed.
D) It remains at rest.
E) It speeds up a little during the tap, but after the tap it soon within a few minutes slows down and comes to rest.
Question 2
A race car circles 10 times around a circular 8.0-km track in 20 min. Using SI units
(a) what is its average speed for the ten laps?
(b) what is its average velocity for the ten laps?
What will be an ideal response?
The Pleiades, an open cluster of stars in the constellation of Taurus. These stars share a common mo
Spitzer Space Telescope
The Western Front, 1918
Press with (A) fingertips into GB-30; or (B) with thumb into GB-30; press 2–3 times.
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