What evidence do we have that the Universe is expanding?
What will be an ideal response?
Redshifts of the galaxies are proportional to distance.
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An electric device delivers a current of 5.0 A to a device. How many electrons flow through this device in 10 s? (e = 1.60 × 10-19 C)
A) 0.20 B) 20 C) 2.0 D) 3.1 × 1020 E) 31 × 1020
Why should the experimenter avoid using the end of a meter stick when making a measurement?
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.
Components: If a vector 
has components Ax > 0, and Ay < 0, then the angle that this vector makes with the positive x-axis must be in the range
A. 0° to 90°. B. 90° to 180°. C. 180° to 270°. D. 270° to 360°. E. It cannot be determined without additional information.