An object that is giving off only infrared electromagnetic waves is giving off heat through:
a. radiation.
c. convection.
b. conduction.
d. visible light.
A
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In a solar hot-water system, the hot-water tank is maintained at 130°C. It is desired to have the solar heater heat the feed water going into the tank to 180°C. Determine the amount of heat per kilogram of water required from the solar heater to heat the water from 130°C to 180°C. Assume that the hot-water heater runs at constant pressure.
What will be an ideal response?
The horizontal surface on which the objects slide is frictionless. If M = 2.0 kg, the tension in string 1 is 12 N. Determine F.
A. 25 N B. 20 N C. 30 N D. 35 N E. 40 N
Brownian motion is caused by
A) thermal agitation. B) perpetual motion. C) particles larger than atoms bumping into them. D) interactions between atoms and molecules. E) almost invisible bugs.
According to Galileo, which of these is a "natural" or "unforced" motion?
A) A stone falling straight downward. B) A book coming to rest as it slides along the floor. C) Both of the above. D) Neither of the above.