The coefficient of performance (COP) of a refrigerator is defined as the ratio of
A)
the heat removed from the inside to the heat expelled to the outside.
B)
the heat expelled to the outside to the heat removed from the inside.
C)
the heat removed from the inside to the work done to remove the heat.
D)
the heat expelled to the outside to the work done to remove the heat.
E)
the difference between the heat expelled to the outside from the heat removed from the inside to the work done to remove the heat.
C
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Interstellar gas clouds may collapse to form stars if they
a. have very high temperatures. b. encounter a shock wave. c. rotate rapidly. d. are located near main sequence spectral type K and M stars. e. all of the above.
The radio signals from Earth are greater than from the Sun
Indicate whether the statement is true or false
A neutron carries a negative charge
Indicate whether the statement is true or false
A 1.7-m tall woman stands 8.0-m in front of a camera with a 5.0-cm focal length lens. What is the size of the image formed on film?
a. 23.5 cm b. 2.7 cm c. 1.1 cm d. 68.0 cm e. 0.37 cm