Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP) of 4.0
when operated as a refrigerator and a COP of 5.0 when operated as a heat pump. What is its thermal efficiency when operated as a heat engine doing work?
A) 20% B) 10% C) 45% D) 80% E) 25%
A
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A cube is subjected to a pressure of 12 atmospheres. The un-squeezed length of one side of the cube is 10.000 cm. The squeezed length of one side of the cube is 9.999 cm. The bulk strain on the cube is
a. 
b. 
c. 
d. 
e. 
Science can say nothing about the validity of nonscientific practices that do not make testable predictions
Indicate whether the statement is true or false
An ionized gas is a state of matter called a __________
Fill in the blank(s) with correct word
At which of the following speeds would the effects predicted by special relativity be most obvious?
A. 0.50c B. 1.11c C. 0.99c D. 0.01c