A drill bit can become very hot when one is drilling a hole in a metal plate. If we take the system to be the drill bit, does heat flow into or out of the system?
A. Heat flows into the system.
B. Heat flows out of the system.
C. No heat flows in either direction.
B. Heat flows out of the system.
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The ________ explains why the spectral lines from a rapidly rotating star are broader than those from a slowly rotating star
Fill in the blank(s) with correct word
A spaceship moves over my driveway at a relativistic speed. I observe that my driveway is the same length as the ship. I then conclude that the rest length of my driveway is ________ the rest length of the spaceship.
A. greater than B. less than C. the same as
According to the nebular theory of solar system formation, which law best explains why the central regions of the solar nebula got hotter as the nebula shrank in size?
A) the law of conservation of energy B) the law of conservation of angular momentum C) Newton's third law D) the two laws of thermal radiation
A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular velocity of 20.0 radians per seconds, then the period of the rotational motion is
A. 0.143 s. B. 0.224 s. C. 0.314 s. D. 0.421 s. E. 0.558 s.