A primitive space heater consists of a 10.0 cm radius iron ball through which electrical current was passed in order to heat the ball and subsequently the surrounding air. If the temperature of the iron ball was kept at 530 K and the room temperature was 
what power would be radiated into the room? Assume the ball is a perfect blackbody.
A. 140 W
B. 110 W
C. 430 W
D. 480 W
C. 430 W
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Two tuning forks sounding together result in a beat frequency of 3 Hz. If the frequency of one of the forks is 512 Hz, what is the frequency of the other?
a. 509 Hz or 515 Hz c. 518 Hz or 506 Hz b. 105 Hz d. 85 Hz
This figure shows the motions of atoms (a) in a falling ball and (b) after the ball hits the ground. Why would you not expect the ball on the ground to suddenly move upward?
a. Because it is exceedingly unlikely that the velocities of the atoms would simultaneously reorder themselves to generally point upward. b. It would violate the first law of thermodynamics. c. Both a. and b.
What is the kinetic energy of a 5,000 kg truck traveling at 25 m/s?
It is generally easier to push an object once it is moving than when one is getting it started. Why is this?