A violation of the second law of thermodynamics would occur if
A. a ball lying on the ground started to bounce.
B. transfer of energy by heat moved energy from an object at low temperature to an object at a higher temperature.
C. a refrigerator heated the air in the room in which the refrigerator is located.
D. any of the above occurred.
E. (a) or (b) occurred, but not (c).
Answer: E
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A wave is represented by the equation y(x, t) = 3.2 cm sin(1000 rad/s t - 50
x). Another wave is represented by the equation y(x, t) = 4.2 cm sin(1000 rad/s t - 50
x). If the two waves interfere destructively, then what is equation that represents the coherent superposition of the two waves?
A. y(x, t) = 7.4 cm sin(1000 rad/s t + 50.0
x)
B. y(x, t) = 1.0 cm sin(1000 rad/s t - 50.0
x)
C. y(x, t) = 1.0 cm sin(1000 rad/s t + 50.0x)
D. y(x, t) = 7.4 cm sin(1000 rad/s t - 50.0x)
How many stars can you see with your naked eye on a clear, moonless night from a dark location?
A) fewer than a thousand B) a few thousand C) about ten thousand D) about a hundred thousand E) more than you could count in your lifetime
What drives the motion of the continental plates on Earth?
A) lava flows in trenches along the sea floor B) tidal forces C) convection cells in the mantle D) Earth's magnetic field E) rotation of the liquid core
A child pulls on a wagon with a horizontal force of 75 N. If the wagon moves horizontally a total of 42 m in 3.0 min, what is the average power generated by the child?
A) 18 W B) 22 W C) 24 W D) 27 W