Two objects attract each other gravitationally. If the distance between their centers doubles, the gravitational force
A. is a half.
B. doubles.
C. is a fourth.
D. quadruples.
C. is a fourth.
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In the situation described in problem N12T.6, what do you think will happen to the satellite’s speed as time passes?
A. It slowly decreases. B. It remains roughly the same. C. It slowly increases.
During the hydrogen shell burning phase:
A) the star grows more luminous. B) the star becomes less luminous. C) helium is burning in the core. D) the core is expanding. E) hydrogen is burning in the central core.
What is the speed of sound in the air inside a furnace where the temperature is 500 degrees Celsius (773 Kelvin)?
Superconductors have been discussed as a means for electrical energy storage. Because they are resistanceless, a current once started in a loop would continue without loss. If a current of 1.0 × 10^4 A were started in a huge toroidal coil of radius 1.0 km and inductance 50 H, how much electrical energy (in kWh) could be stored?
a. 300 kWh b. 480 kWh c. 690 kWh d. 840 kWh