A 0.200-kg mass attached to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring will be
A) the same.
B) one-half as much.
C) twice as much.
D) 3 times as much.
E) 4 times as much.
E
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Light in air enters a diamond (n = 2.42) at an angle of incidence of 30.0°. What is the angle of refraction inside the diamond?
a. 11.9° b. 4.90° c. 0.208° d. 24.1° e. 30.0°
Two thermometers are calibrated, one in degrees Celsius and the other in degrees Fahrenheit. At what temperature (in kelvins) do their readings measure the same temperature?
a. 218.15 b. 233.15 c. 273.15 d. 40.15 e. 0
If a 20 W laser beam, which has an initial diameter of 2.0 mm, spreads out to a diameter of 2.0 m after traveling 10,000 m, what is the initial Erms of the beam?
a. 
b. 
c. 
d. 
e. 
Of the following gases, which is the most important contributor to the Earth's greenhouse effect?
a. water vapor b. ozone c. CFCs d. methane