An 8.0 kg-m2 wheel with 155. Joules of rotational kinetic energy requires what torque to bring it to rest in 4.0 s?
A) -1.6 N-m
B) -1.2 N-m
C) +0.88 N-m
D) -1.8 N-m
E) -1.0 N-m
E
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_____ says that the total mass of a star must equal the sum of the masses of its shells
A) The law of conservation of mass B) The law of mass action C) Fick's first law of mass transfer D) Newton's law of mass accumulation
The three lowest resonate frequencies of a system are 50 Hz, 150 Hz, and 250 Hz. The system could be
A. a tube of air closed at both ends. B. a tube of air open at one end. C. a tube of air open at both ends. D. a vibrating string with fixed ends.
To see the Sun's hot corona (a temperature of 1,000,000 K), which part of the electromagnetic spectrum should one observe?
A) the visible B) the X-ray C) the ultraviolet D) the radio E) the infrared
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).