All celestial objects rise in the east and set in the west because
A. Earth is rotating from west to east.
B. Earth is orbiting around the Sun from east to west.
C. Earth is rotating from east to west.
D. the celestial sphere is rotating from east to west.
Answer: A
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A 2000 N car travels 50 m along a level road, powered by a drive force of 1000 N. The work done by the drive force is
A) 50,000 J. B) 10,000 J. C) zero. D) 1000 J. E) 2000 J.
A machinist needs to remove a tight fitting pin of material A from a hole in a block made of material B. The machinist heats both the pin and the block to the same high temperature and removes the pin easily
What statement relates the coefficient of thermal expansion of material A to that of material B? A) Material B has a greater coefficient of expansion than does material A. B) The situation is not possible because heating block B will shrink the hole in the material as the material expands with increasing temperature. C) Material B has the same coefficient of expansion as does material A. D) Material A has a greater coefficient of expansion than does material B.
A heavy downpour associated with a severe local storm is commonly referred to as
a) a rainstorm. b) a blizzard. c) a shower. d) an electrical storm.
The accelerating force of the wind on a small 250-kg sailboat is 707 N northeast. If the drag of the keel is 500 N acting west, what is the acceleration of the boat?
a. 1.5 m/s2 due east c. 3.0 m/s2 northeast b. 2.5 m/s2 due north d. 2.0 m/s2 due north