What do Viking, Pathfinder, and the two Mars Rovers have in common?
A) They all found proof of life on Mars.
B) They all could move over the surface of Mars to examine the rocks.
C) They all were designed to investigate Mars' potential for life.
D) They all are still transmitting data from Mars to Earth.
E) They all proved Mars was too inhospitable for life to have every existed there.
C
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What is the root mean squared velocity of the helium atom in one mole of an ideal gas at a pressure of 2.00 atmospheres and a temperature of 
A. 782 m/s B. 846 m/s C. 902 m/s D. 940 m/s E. 1374 m/s
The critical temperature to initiate the proton-proton cycle in the cores of stars is
A) 3,000 K. B) 5,800 K. C) 2,300,000 K. D) 10 million K. E) 100 million K.
Take a piece of paper and fold it in half. Place it on a table like a tent and gently blow underneath it. The paper will then
A. fly up off the table. B. not move at all, if you are careful to blow underneath it. C. flatten down on the table.
Just after a big fish swallows a small fish, the momentum of the two-fish system is
A) greater after lunch than before. B) the same before and after lunch. C) somewhat less after lunch.