Which one of the following processes of heat transfer requires the presence of a fluid?
a. conduction
c. convection
b. radiation
d. None of the choices are valid.
C
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On the autumnal equinox the Sun is
a. 23.4° north of the celestial equator. b. 23.4° south of the celestial equator. c. on the celestial equator and moving north with respect to the equator. d. on the celestial equator and moving south with respect to the equator. e. closest to the north celestial pole.
When a liquid copper-nickel alloy is rapidly cooled, the center of the grains has a higher concentration of nickel atoms than the average concentration. This is _____________.
Fill in the blank(s) with the appropriate word(s).
A 92.5 kg stunt man stands on a piston that will launch him out of a vertical tube. The piston applies a constant force F to the man’s feet. Starting from rest, the force is applied for 1.20 s, and during that time interval, the man attains a velocity of 25.5 m/s. What was the man’s apparent weight during this time interval?
A. Unable to answer without knowing the value of F B. 3740 N C. 1970 N D. 2830 N E. 2870 N
The most efficient engine possible is the
A) Joule cycle. B) Wright cycle. C) Kelvin cycle. D) Carnot cycle. E) Otto cycle.