Suppose you were to try to create a proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What energy photon would be required?
A) 1.022 MeV
B) 223. MeV
C) 1.88 GeV
D) 940. MeV
E) 0.47 GeV
C
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Suppose that we look at a photograph of many galaxies. Assuming that all galaxies formed at about the same time, which galaxy in the picture is the youngest?
A) the one that is reddest in color B) the one that is bluest in color C) the one that is farthest away D) the one that is closest to us E) the one that appears smallest in size
The electric arc furnace uses ___________% scrap steel.
Fill in the blank(s) with the appropriate word(s).
120 J of heat flows by thermal conduction from
to 
What is the change in entropy for this process?
A. 0.034 J/K B. 0.118 J/K C. 0.201 J/K D. 0.338 J/K
What is the angular speed, in rad/s, of a flywheel turning at 813.0 rpm?
A) 85.14 rad/s B) 13.53 rad/s C) 63.84 rad/s D) 95.33 rad/s