Who demonstrated that when heat is gained or lost by a system during some process, the gain or loss can be accounted for by an equivalent quantity of mechanical work done on the system?
a. Joule
b. Boltzmann
c. Thompson, Count Rumford
d. Kelvin
a
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If a galaxy is moving away from us at 1.0% of the speed of light, how far away is it from us?
A) 14 ly B) 140 ly C) 140 thousand ly D) 140 million ly E) 140 billion ly
Uniform Electric Fields: In a region where the electric field is uniform and points in the +x direction, the electric potential is -2000 V at x = 8 m and is +400 V at x = 2 m. What is the magnitude of the electric field?
A. 200 V/m B. 300 V/m C. 400 V/m D. 500 V/m E. 600 V/m
A mechanic working on a 100-m radar tower drops a hammer weighing 44.5 N. The work done on the hammer as it falls is
a. 4.45 N-m. b. 44.5 N-m. c. 445 N-m. d. 4,450 N-m.
A 100-g sample of a certain substance undergoes a transformation of some kind that releases 20,000 J of energy. What kind of transformation is this likely to be?
A. A temperature change B. A phase change C. A chemical reaction D. A nuclear reaction E. It is impossible to guess.