The outflow channels on Mars indicate a flood period in the history of Mars. During this time, based on the width and depth of the remaining riverbed, it is thought that the flow rate must have been:
A) just a small trickle, barely more than a stream of water.
B) moderate, about the flow rate of the Ohio River.
C) fairly large, about the flow rate of the current Colorado River.
D) significantly large, about the flow rate of the Amazon River.
E) enormous, as much as 100 times the flow rate of the Amazon River.
E
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Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 2sin(?x)cos(3?t), where x is in m and t is in s. What is the distance (in m) between the first two antinodes?
a. 8 b. 2 c. 4 d. 1 e. 0.5
The occasional backward motion of the planets against the background of fixed stars is called _____
A) anterograde motion B) rotation C) oscillation D) retrograde motion
Thermodynamic Devices: An ideal Carnot engine is operated as an air conditioner to cool a house in the summer. The air conditioner removes 14 kJ of heat per second from the house, and maintains the inside temperature at 293 K, while the outside temperature is 369 K. The power required to run the air conditioner under these operating conditions is closest to
A. 3600 W. B. 4400 W. C. 5100 W. D. 5800 W. E. 6600 W.
14C has a half-life of 6000 years. An ancient corpse is uncovered and found to have 1/32--one thirty-second--of the normal amount of 14C found in the bodies of people now living. How long has the body been dead?
A) 24,000 years B) 6000 years C) 12,000 years D) 30,000 years E) 36,000 years