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 thermodynamic pump
What is its thermal efficiency when operated as a thermodynamic engine doing work? A) 10%
B) 20%
C) 25%
D) 45%
E) 80%
B
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The photoelectric effect occurs when electrons are emitted when light strikes the surface of a metal
a. True b. False Indicate whether the statement is true or false
The inductive reactance of an RLC circuit is 36
If the frequency is doubled, what is the new inductive reactance?
A. 72
B. 36
C. 19
D. 6.0
E. 3.0
The current through a 10-ohm resistor connected to a 120-V power supply is
A) 1 A. B) 10 A. C) 12 A. D) 120 A. E) none of the above
A note is being played on a string on a guitar. The string is then pushed to the side while still in contact with the same fret. What happens to the frequency of the note then played compared to the original note?
a. It is the same note since the same fret is being used. b. It is at higher frequency than the original note. c. It is at lower frequency than the original note. d. It can be either higher of lower frequency depending on whether the original note was above or below middle C.