The gravitational force in a molecular cloud depends on
A) density only.
B) temperature only.
C) density and temperature.
D) composition.
E) thermal pressure.
A
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How many neutrons are in a 
nucleus?
A. 79 B. 179 C. 118 D. Some other number (specify)
The specific heat of an ideal gas at constant pressure is greater than the specific heat of an ideal gas at constant volume because
a. work is done by a gas at constant pressure. b. work is done by a gas at constant volume. c. no work is done by a gas at constant pressure. d. the temperature remains constant for a gas at constant pressure. e. the temperature remains constant for a gas at constant volume.
A chemical combination of two or more substances in variable proportions is called
a. a mixture. b. a compound. c. an ion. d. a molecule.
The rotational inertia of the dumbbell (see figure) about axis A is twice the rotational inertia about axis B. The unknown mass is: