A violation of the second law of thermodynamics would occur if
a. a ball lying on the ground started to bounce. b. transfer of energy by heat moved energy from an object at low temperature to an object at a higher temperature. c. a refrigerator heated the air in the room in which the refrigerator is located. d. any of the above occurred. e. (a) or (b) occurred, but not (c).
E
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If a negatively charged object is brought near a suspended, positively charged object, the suspended object will be
a. repelled. b. charged more. c. discharged. d. attracted.
You discover a binary star system in which one star is a 15 MSun main-sequence star and the other is a 10 MSun giant. How do we think that a star system such as this might have come to exist?
A) The two stars probably were once separate, but became a binary when a close encounter allowed their mutual gravity to pull them together. B) Although both stars probably formed from the same clump of gas, the more massive one must have had its birth slowed so that it became a main sequence stars millions of years later than its less massive companion. C) The giant must once have been the more massive star, but is now less massive because it transferred some of its mass to its companion. D) The two stars are simply evolving normally and independently, and one has become a giant before the other.
A ball is thrown directly upward and experiences no air resistance. Which one of the following statements about its motion is correct?
A) The acceleration of the ball is upward while it is traveling up and downward while it is traveling down. B) The acceleration of the ball is downward while it is traveling up and upward while it is traveling down. C) The acceleration is downward during the entire time the ball is in the air. D) The acceleration of the ball is downward while it is traveling up and downward while it is traveling down but is zero at the highest point when the ball stops.
Infrared observations are used to determine the mass of asteroids because ________.
A. most asteroids are made of dark minerals which are more efficient at reflecting infrared light than visible light B. the Hubble Space Telescope only has infrared cameras C. the infrared radiation is the glow of heat from the asteroid, and larger asteroids emit more infrared light D. asteroids reflect too little visible light to use optical telescopes for the measurements