An object of mass m is on the surface of the Earth. The distance to the Sun and the Moon are dS and dM, and the masses of the Sun and Moon are MS and MM. What is the ratio of the gravitational force from the Sun to that of the Moon on the object?
a. MSMM /dSdM
b. MSMM /d2Sd2M
c. MSd2M /MMd2M
d. MMd2S /MSd2M
c
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What is the maximum theoretical efficiency possible for a heat engine operating between a reservoir in which ice and water coexist, and a reservoir in which water and steam coexist? The pressure is constant at 1.0 atmosphere for both reservoirs
A) 27% B) 45% C) 73% D) 17%
In an ac circuit, the current in an inductor
A. leads the voltage by 90
B. lags the voltage by 90
C. is in phase with the voltage.
D. leads the voltage by
radians.
E. lags the voltage by
radians.
If Earth's axis had no tilt, would we still have seasons? Why or why not?
What will be an ideal response?
_______________ theoretical assumptions on quantization overcame the difficulty with a major problem with understanding blackbody radiation.
A. Hertz's B. Planck's C. Einstein's D. Maxwell's E. Bohr's