Some type of solar eclipse will happen about
A) every month at new Moon.
B) every week at full Moon.
C) every month at full Moon.
D) about every six months at new Moon.
E) every year at new Moon.
D
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An air mass forming over the Gulf of Mexico would be classified as
a. mE. b. mT. c. aP. d. cE.
The half-life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is
a. 35 years. b. 70 years. c. 125 years. d. 140 years. e. none of the above.
Two masses are being pulled up a 30.0 degrees incline by a force F parallel to the incline. The acceleration up the incline is 1.00 
and the velocity is up the incline. The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass. The coefficient of kinetic friction is 0.200. The tension in the string is
A. 2,660 N. B. 1,140 N. C. 980 N. D. 875 N. E. 633 N.
Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is doubled and the current in the other wire is halved, what happens to the magnitude of the force between these two wires?
A) It is doubled. B) It stays the same. C) It is tripled. D) It is quadrupled. E) It is reduced by a factor of 2.