Nuclear Binding Energy: Radium-226 decays into radon-222 plus an alpha particle. The relevant masses are
How much energy is released in this process? (1 u = 931.5 MeV/c2)
A. 4.24 MeV
B. 3.76 MeV
C. 4.87 MeV
D. 5.05 MeV
E. 5.39 MeV
Answer: C
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Three 1.0 
C charges are placed along the x-axis, one charge at x = -10 cm, another at the origin, and the last one at x = 10 cm. What is the total potential energy of this arrangement?
A. 0.27 J B. -0.27 J C. 0.72 J D. 0.23 J E. infinite (or indeterminate)
If in every direction we point to a star, then the conundrum that the sky is dark is known as ___________
Fill in the blank(s) with correct word
One of the reasons that Kapteyn underestimated the size of the Milky Way and Shapley overestimated it is that they did not recognize the ________.
A. dimming effect of interstellar dust B. age of the globular clusters C. effects of the motion of the Sun from the center D. existence of dark matter
An automobile driver puts on the brakes and decelerates from 35.0 m/s to zero in 11.0 s. What distance does the car travel?
a. 193 m b. 97 m c. 241 m d. 290 m e. 145 m