The energy in an earthquake is released
A) all at once.
B) before the quake, after the quake, and during the quake.
C) as an epicenter focus.
D) in unconsolidated rock.
Answer: B
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Which of the following is true of the cosmic microwave background?
A) It is radiation that existed before the big bang. B) It appears to come from a blackbody. C) It is radiation present in the ultraviolet spectrum. D) It has a very small redshift of about 10.
Photoelectric Effect: When the surface of a metal is exposed to blue light, electrons are emitted. If the intensity of the blue light is increased, which of the following things will also increase?
A. the number of electrons ejected per second B. the maximum kinetic energy of the ejected electrons C. the time lag between the onset of the absorption of light and the ejection of electrons D. the work function of the metal E. All of these
A mass 
is connected by a light string that passes over a pulley of mass M to a mass 
as shown in the figure. Both masses move vertically and there is no slippage between the string and the pulley. The pulley has a radius of 20.0 cm and a moment of inertia of 1?2 
If 
is 3.00 kg, 
is 6.00 kg and M is 4.00 kg, then what is the acceleration of the masses?
A. 5.05 
B. 4.75
C. 4.05
D. 3.44
E. 2.67
A camera uses a:
a. diverging lens to form an imaginary image. b. converging lens to form a real image. c. converging lens to form an imaginary image. d. diverging lens to form a real image.