Your friend tells you that last night, they saw Mars high in the sky at midnight. You conclude that
A) Your friend must be mistaken: Mars can never be seen at midnight.
B) Mars must be in retrograde.
C) Mars must be at its closest distance from the Sun.
D) Mars must be at its farthest distance from the Earth.
B
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If an observer walks north toward increasing latitude, the number of circumpolar stars would
a. remain constant. b. decrease. c. increase. d. Unknown unless you also state the longitude of the observer.
The value of the dot product of two vectors depends on the particular coordinate system being used
A) True B) False
A heat engine absorbs 2 500 J of heat from a hot reservoir and expels 1 000 J to a cold reservoir. When it is run in reverse, with the same reservoirs, the engine pumps 2 500 J of heat to the hot reservoir, requiring 1 500 J of work to do so. Find the ratio of the work done by the heat engine to the work done by the pump. Is the heat engine reversible?
a. 1.0 (no) b. 1.0 (yes) c. 1.5 (yes) d. 1.5 (no) e. 2.5 (no)
A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into a room per cycle. How much work is required in each cycle?
A) 4 kJ B) 20 kJ C) 22 kJ D) 24 kJ E) 44 kJ