A heat engine operating between a pair of hot and cold reservoirs with respective temperatures of 500 K and 300 K will have what maximum efficiency?
a. 60%
c. 40%
b. 50%
d. 30%
C
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Which of the following is not caused by side branches on a polymer?
(a) Decreased density (b) Decreased transparency (c) Decreased crystallinity (d) Decreased hardness
A block of wood slides to a stop along a tabletop. In this process,
A) energy is lost. B) both energy and energy quality remain unchanged but thermal energy is gained while kinetic energy is lost. C) energy remains unchanged but energy quality is lost. D) energy remains unchanged but energy quality is gained. E) both energy and energy quality remain unchanged but thermal energy is lost while kinetic energy is gained.
The number of joules in 1 kilocalorie is
A) 4.19. B) 41.9. C) 4190. D) 1054.
In a location where the train tracks run parallel to a road, a high speed train traveling at 60 m/s passes a car traveling at 30 m/s. How long does it take for the train to be 180 m ahead of the car?
a. 2.0 s b. 3.0 s c. 6.0 s d. 9.0 s e. 18.0 s