A vessel containing 5.0 kg of water at 10°C is put into a refrigerator. The 1/7 HP motor (1 HP = 746 W) runs for 5.0 minutes to cool the liquid to the refrigerator's low temperature, 0°C. What is the COP of the refrigerator?
a. 5.7
b. 4.6
c. 6.5
d. 7.2
e. 3.6
c
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Humanity is very new to the Universe
a. True b. False Indicate whether the statement is true or false
Our solar system consists of
A) the Sun and all the objects that orbit it. B) the Sun and the planets, and nothing else. C) a few hundred billion stars, bound together by gravity. D) the Sun and several nearby stars, as well as the planets and other objects that orbit these stars.
An ideal gas is compressed isothermally to one-third of its initial volume. The resulting pressure will be
A) three times as large as the initial value. B) less than three times as large as the initial value. C) more than three times as large as the initial value. D) equal to the initial value. E) impossible to predict on the basis of this data.
When a material is found to have a definite volume and definite shape, and when it doesn't require a container to maintain its shape, what is the phase of the material?
a. Gas b. Liquid c. Plasma d. Solid