An ideal, reversible heat pump is taking heat from the outside air at -10.0°C and discharging it into the house at 18.0°C. What is the coefficient of performance of this heat pump?
A)
10.4
B)
9.44
C)
0.644
D)
0.533
E)
0.0962
A
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Two concentric circular wire loops in the same plane each carry a current. The larger loop as a current of 8.46 A circulating clockwise and has a radius of 6.20 cm. The smaller loop has a radius of 4.42 cm. What is the magnitude and direction of the current in the smaller loop if the total magnetic field at the center of the system is zero?
A. 6.03 A CCW B. 6.03 A CW C. 12.8 A CCW D. 12.8 A CW
How many joules of energy are used by a 2.0 hp motor that runs for 1.0 hr?
What will be an ideal response?
A sample of an ideal gas is slowly compressed to one-half its original volume with no change in temperature. What happens to the average speed of the molecules in the sample?
A) It does not change. B) It becomes 4 times as great. C) It becomes 2 times as great. D) It becomes 1/2 as great. E) It becomes 1/4 as great.
The period and the frequency of a sound wave are
A. multiples of each other-period is 2? times the frequency. B. independent of each other. C. reciprocals of each other. D. None of these choices are correct