You have a choice between two lenses of focal lengths fa and fb, where fb = 2fa, to use as the objective lens in building a compound microscope. If the magnification you obtain using lens a is Ma, what will be the magnification when using lens b?
A) Mb = 2 Ma
B) Mb = 4 Ma
C) Mb = 8 Ma
D) Mb = Ma/4
E) Mb = Ma/2
E
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The motion of a particle connected to a spring is described by x = 10 sin (?t). At what time (in s) is the potential energy equal to the kinetic energy?
a. 0 b. 0.25 c. 0.50 d. 0.79 e. 1.0
Why is Venus's atmosphere hotter than Mercury even though it is farther from the Sun?
a. Venus has a thin atmosphere thus allowing more of Sun's radiation to enter. b. Venus contains water vapor in its atmosphere, which absorbs more heat. c. Venus contains 96 percent CO2 resulting in very hot temperatures d. Mars contains more CO2, which has a cooling effect on its atmosphere. e. Mercury has a hotter atmosphere because it is closer to the Sun than Venus.
Consider the equipotential diagram shown in problem E3T.12. In the expression 
, what is the approximate value of b?
A. 8
B. 2
C. 0
D. 1/2
E. 1/8
F. Some other value (specify)
S0 galaxies have spiral arms, but little to no gas and dust. This is believed to happen because ____
a. their gas has been cannibalized by other galaxies b. they have had bursts of star formation during major collision the gas and dust formed new stars c. starburst events have used up all of the gas and dust in the disk d. gas and dust have been stripped from the galaxies as they pass through hot, intergalactic gas e. tidal interactions have forced the gas into the central bulge