An uncharged metal sphere is placed on an insulating puck on a frictionless table. While being held parallel to the table, a rod with a charge q is brought close to the sphere, but does not touch it. As the rod is brought in, the sphere
a. remains at rest.
b. moves toward the rod. c. moves away from the rod. d. moves perpendicular to the velocity vector of the rod. e. moves upward off the puck.
B
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Estimate the surface area of an adult human’s head.
A. 0.05 
B. 0.1
C. 0.05
D. 0.01
A new electric power plant has an efficiency of 42%. For every 100 barrels of oil needed to run the turbine, how many are essentially lost as waste heat (in barrels of oil) to the environment?
a. 21 b. 42 c. 58 d. 10 e. 79
The following images were all taken by spacecraft. Which one shows a comet?
What is an emission nebula?
A. a region of ionized gas around hot O or B type stars B. a region of gas around cool K or M type stars C. a gas cloud in globular clusters D. a region of gas around black holes