Thermodynamic Devices: 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
Answer: A
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A transverse periodic wave is represented by the equation y(x, t) = 1.50 cm sin(1,500 rad/s t - 10.0
x). Another transverse wave is represented by the equation y(x, t) = 1.50 cm sin(1,500 rad/s t - 10.0
x). What is the equation that represents the superposition of the two waves?
A. y(x, t) = 3.0 cm sin(1,500 rad/s t - 10.0
x)
B. y(x, t) = 3.0 cm sin(1,500 rad/s t) cos(10.0x)
C. y(x, t) = +3.0 cm cos(1,500 rad/s t) sin(10.0x)
D. y(x, t) = 3.0 cm sin(1,500 rad/s t + 10.0x)
A long line of charge with charge per unit length ?1 is located on the x-axis and another long line of charge with charge per unit length ?2 is located on the y-axis with their centers crossing at the origin
In what direction is the electric field at point z = a on the positive z-axis if ?1 and ?2 are positive? A) the positive z-direction B) halfway between the x-direction and the y-direction C) the negative z-direction D) all directions are possible parallel to the x-y plane E) cannot be determined
Voltage can also be called
a. potential b. pressure c. work d. energy e. none of the above
On a warm day a pool of water transfers energy to the air as heat and freezes. This is a direct violation of:
A. the zeroth law of thermodynamics B. the first law of thermodynamics C. the second law of thermodynamics D. the third law of thermodynamics E. none of the above