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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If the temperature and pressure of an ideal gas is tripled, what is the ratio of the new volume to initial volume?
A. 1 B. 9 C. 3 D. 0.33
Why is there a 4-minute difference between the solar day and the sidereal day?
because the Earth's rotation is variable due to the pull of the Moon. because the Earth's axis is tilted by about 23 degrees. because the Earth is going around the Sun in the course of a year. because the stars slowly change their orientations in the galaxy.
A charge (uniform linear density = 9.0 nC/m) is distributed along the x axis from x = 0 to x = 3.0 m. Determine the magnitude of the electric field at a point on the x axis with x = 4.0 m
a. 81 N/C b. 74 N/C c. 61 N/C d. 88 N/C e. 20 N/C
A series RLC circuit has a capacitive reactance of 16 
and an inductive reactance of 4.0
at 30 Hz. What frequency would result in resonance for this circuit?
A. 12 Hz B. 60 Hz C. 15 Hz D. 7.5 Hz E. Resonance is not possible in this case.