If the rotating coil used in a generator has its radius doubled, what change results in the amplitude of the voltage produced?
a. It doubles.
b. It quadruples.
c. It is increased by a factor 23/2
d. It stays the same.
b
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A crate is sliding down a 30° incline, picking up speed as it slides. Ignore air friction. (a) Which of the forces listed below that acts on the crate has the greatest magnitude?
A. 
B. 
C. Both and (which are equal)
D. 
E.
If I have a circuit which has unwanted current variations (with time) and I want to "smooth them out" (want a more steady current), which one of these should be added in series?
A) battery B) capacitor C) inductor D) resistance
The period-luminosity relation for Cepheid variables was discovered in 1908 by:
A) William Herschel. B) Henrietta Leavitt. C) Harlow Shapley. D) Heber Curtiss. E) Edwin Hubble.
The neutral hydrogen atom consists of
a. one proton and one neutron. b. one proton. c. one proton, one neutron, and one electron. d. one proton and one electron. e. an isotope and an ion.