The Sun will finally become a
a. brown dwarf.
b. neutron star.
c. black hole.
d. white dwarf.
d
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The temperature of a 50 g sample of aluminum is raised from 20oC to 60oC when 440 cal of heat are added. The specific heat capacity of the aluminum is
A. 0.22 cal/g C°. B. 0.91 cal/g C°. C. not calculable from this data. D. 0.11 cal/g Co. E. 15.4 cal/g C°.
A heat engine
a. converts heat to work. b. converts heat to internal energy. c. transfers heat from a low-temperature reservoir. d. converts work to heat.
Carnot Engine: An ideal Carnot heat engine has an efficiency of 0.600. If it operates between a deep lake with a constant temperature of 294.0 K and a hot reservoir, what is the temperature of the hot reservoir?
A. 735 K B. 490 K C. 470 K D. 784 K
A nylon bar (E 5 2.1 GPa) with diameter 12 mm, length 4.5 m, and weight 5.6 N hangs vertically under its own weight. The elongation of the bar at its free end is approximately:
(A) 0.05 mm
(B) 0.07 mm
(C) 0.11 mm
(D) 0.17 mm