In our galaxy, once we look outside the inner regions, the disk rotates at
A: a much faster speed in the outer regions than in the inner regions.
B: a much slower speed in the outer regions than in the inner regions.
C: about the same speed at various distances from the center of the galaxy
Ans: C: about the same speed at various distances from the center of the galaxy
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A 150-N sled is pulled up a 28° slope at a constant speed by a force of 120 N. What is the coefficient of kinetic friction between sled and slope?
a. 0.53 c. 0.37 b. 0.22 d. 0.33
A thin lens of focal length 12.5 cm has a 5.0 cm tall object placed 10 cm in front of it. What is the size and orientation of the image?
A. 4.0 cm, inverted B. 4.0 cm, upright C. 8.9 cm, inverted D. 8.9 cm, upright E. 25 cm, upright
Imagine that we constrain a rectangular loop to move through a square region where the magnetic field 
is uniform and downward (in the -z direction), as shown below. Assume that 
outside that region. We can divide the loop’s motion up into five phases: For each of the five phases, which of the following is true? The loop has not yet entered the magnetic field.
A. Current flows clockwise in the loop.
B. Current flows counterclockwise in the loop.
C. Current does not flow in the loop.
The NASA lander which deployed the first rover, Sojourner, in 1997 was:
A) Mars Rover. B) Global Surveyor. C) Viking 2. D) South Polar Lander. E) Pathfinder.