A 2C charge and a 4C charge attract each other with 10N of force. How much will a 2C charge and a 12C charge attract each other when placed the same distance apart?
a. 5N.
b. 12N.
c. 10N.
d. 30N.
Ans: d. 30N.
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The 1964 experiment that checked the validity of the principle of the constancy of lightspeed involved
A) a NASA satellite that emitted radiation both forward and backward. B) jet planes carrying a highly accurate atomic clock, and a similar clock on Earth. C) a fast-moving sub-atomic particle that emitted radiation both forward and backward. D) the emission of light from two atoms that were at rest on Earth. E) comparison of the speeds of two parallel light beams, one emitted on Earth and other emitted from a jet airplane.
Two masses are being pulled up a 30.0 degrees incline by a force F parallel to the incline. The acceleration down 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. 840 N. B. 980 N. C. 1,140 N. D. 1,530 N. E. 2,660 N.
You are once again in a hot, dense place. You are surrounded by protons and neutrons, some rapidly fusing into helium. You notice that your surroundings are cooling (good, because it's really hot!) and rapidly dropping in density
Within about 3 minutes, the fusion reactions stop. Where are you? A) You are in the center of a star very much like our Sun. B) You are in the early universe during the era of nucleosynthesis. C) You are inside a nuclear power plant on Earth. D) You are in the center of a star much smaller than the Sun. E) You are in the center of a massive star near the end of its life.
A series circuit contains an 80-?F capacitor, a 0.020-H inductor, and a switch. The resistance of the circuit is negligible. Initially, the switch is open, the capacitor voltage is 50 V,
and the current in the inductor is zero. At time t = 0 s, the switch is closed. When the current in the circuit is 1.5 A, what is the charge on the capacitor? A) 2000 µC B) 2500 µC C) 3000 µC D) 3500 µC E) 4000 µC