When a light ray in air enters water at 15° from the normal, it
A) always bends toward the normal.
B) always bends away from the normal.
C) sometimes bends towards or away from the normal.
D) does not bend.
Answer: A
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The "energy efficiency" of a device is
A) the total energy put into the device divided by its useful energy output. B) its thermal energy output divided by the total energy put into the device. C) its total energy output divided by the total energy put into the device. D) its useful energy output divided by the total energy put into the device. E) the total energy put into the device divided by its thermal energy output.
The internal energy of an ideal gas is changed by adding heat Q to the system and also by doing work W on the gas. What is the change in internal energy of the gas?
A) 4.186Q - W B) Q - 4.186W C) W - Q D) Q + W E) Q - W
A vertical spring has a mass hanging from it, which is displaced from the equilibrium position and begins to oscillate. At what point does the system have the least potential energy?
A) at the highest point B) at one-fourth of the distance between the highest point and lowest point C) at the lowest point D) at the point where the spring is unstretched E) at the equilibrium point
When a gas in a container is squeezed to half its volume with no change in temperature, the gas pressure
A) halves. B) doubles. C) quadruples. D) remains the same.