The ancient water erosion features on the surface of Mars suggest that the planet must have had a much
A) warmer, thinner atmosphere in the past
B) cooler, thicker atmosphere in the past
C) cooler, thinner atmosphere in the past
D) warmer, thicker atmosphere in the past
D
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You live at a latitude of 16° S. What is the angle between the southern horizon and the south celestial pole?
a. 74° b. 164° c. 16° d. 23.4° e. 5°
Energy conservation tells us that the energy of a system can change via
A. Heat transfer B. The energy of a system cannot change C. Work done and/or heat transfer D. Work done on or by the system
When an electron in a hydrogen atom changes its spin from the same to the opposite direction as the proton, it
A) absorbs a visible light photon. B) emits an X-ray photon. C) emits a radio wave photon. D) absorbs a radio wave photon. E) neither emits nor absorbs a photon.
A heat pump has a coefficient of performance of 4 . If the heat pump absorbs 20 cal of heat from the cold outdoors in each cycle, the heat expelled (in cal) to the warm indoors is
a. 34 b. 25 c. 36 d. 40 e. 80