The Roche limit is the
a. distance from the Sun within which a planet cannot retain an atmosphere.
b. minimum mass of an object in the solar system that would be classified as a planet.
c. maximum separation distance between the Sun and a given planet.
d. distance from Earth at which we lose radio communication with a satellite.
e. distance from a planet within which a planet cannot hold itself together.
e
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A 60.0 W light bulb radiates light uniformly in all different directions. What is the average intensity of the light bulb at a distance of 0.400 m from the bulb?
A) 14.9 W/m2 B) 37.2 W/m2 C) 27.4 W/m2 D) 11.9 W/m2 E) 29.8 W/m2
Coulomb's Law: Two point charges, Q1 and Q2, are separated by a distance R. If the magnitudes of both charges are doubled and their separation is also doubled, what happens to the electrical force that each charge exerts on the other one?
A. It increases by a factor of 2.
B. It increases by a factor of 
.
C. It is reduced by a factor of 
.
D. It increases by a factor of 4.
E. It remains the same.
Imagine that an electron had a spin of 5/2 so that its spin quantum number, ms, could have the following six values: ms = +5/2, +3/2, +1/2, –1/2, –3/2, and –5/2 . If this were true, the first element with a filled shell would be
a. He with 2 electrons. b. Be with 4 electrons. c. C with 6 electrons. d. O with 8 electrons.
The principle stating that the work output of a heat engine must be less than its total energy input is called
A) the second law of thermodynamics. B) the kinetic principle. C) the first law of thermodynamics. D) the law of conservation of energy. E) Nonsense--there is no such physical law.