A 1.0-kg chunk of ice at 0°C melts, absorbing 80,000 cal of heat in the process. Which of the following best describes what happens to this system?
a. increased entropy
c. entropy maintained constant
b. lost entropy
d. work converted to energy
A
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Each of the following is a prediction of the theory of relativity. Which one is crucial to understanding how the Sun provides light and heat to Earth?
A) If you observe someone moving by you, you'll see their time running slowly. B) Gravity is curvature of spacetime. C) E = mc2 D) Time runs slower on the surface of the Sun than on Earth. E) Space is different for different observers. Time is different for different observers. Spacetime is the same for everyone.
Three particles are placed in the xy plane. A 30-g particle is located at (3, 4) m, and a 40-g particle is located at (?2, ?2) m. Where must a 20-g particle be placed so that the center of mass of the three-particle system is at the origin?
a. (?3, ?1) m b. (+1, +3) m c. (+3, ?1) m d. (?1, ?3) m e. (?0.5, ?2) m
A wormhole is a
A) passageway to a parallel universe through a black hole B) shortcut between two distant parts of the universe through hyperspace C) shortcut between two distant parts of the universe through a black hole D) way of traveling faster than the speed of light
Motion in a circle at constant speed is motion with constant velocity
a. True b. False Indicate whether the statement is true or false