Initially, the light puck is moving east at 3 m/s while the heavy puck is moving west at 2 m/s. The final velocity of the conjoined pucks is
A. Eastward.
B. Westward.
C. Zero.
D. Impossible to determine.
E. Some other direction (explain).
B. Westward.
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What is the temperature of the universe (as a whole) today?
A) 3K B) 300K C) 3000K D) The universe cannot be said to have a single temperature.
Center of Mass: A 2.0-m rope is lying on a table. You pick up one end and start raising it vertically. How high above the table is the center of mass (or center of gravity) of the rope when half of the rope has lifted off the table?
A. 0.25 m B. 0.50 m C. 0.75 m D. 1.0 m E. 1.5 m
Based on current estimates of the value of Hubble's constant, approximately how old is the universe?
A) 10 billion years old B) 12 billion years old C) 14 billion years old D) 18 billion years old E) 20 billion years old
Venus has a high albedo because its surface is covered by
A) light-colored rocks. B) snow. C) clouds. D) dust storms. E) volcanic ash.