When a warm air mass moves into a region occupied by a cold air mass, the contact zone is called
A) a cold front.
B) a warm front.
C) a stationary front.
D) an occluded front.
Answer: B
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Enceladus orbits Saturn in a resonance with the larger moon Dione. Each time Dione orbits Saturn once, Enceladus orbits _______________
Fill in the blank(s) with correct word
A pair of identical balls is connected by a massless rod, and thrown up into the air. The velocity of the center of mass is initially 17.2 m/s upward. 1.0 s later, one of the balls is measured to be at rest. What is the velocity of the other ball at this time? Ignore air resistance.
A. 14.8 m/s up B. 9.8 m/s down C. 7.4 m/s up D. 7.4 m/s down
According to the theory of cosmic inflation, at what time in the history of the universe did inflation occur?
A) at the very beginning of the big bang B) at the time that the cosmic background radiation formed C) around the third or fourth minute D) around the third or fourth second E) at a tiny fraction of the first second, but not quite at the very beginning of the big bang
The energy associated with a photon of blue light is ________________ the energy associated with a photon of red light
a. greater than c. equal to b. less than d. unrelated to