What is in the box shown below? 
A. Positive charge
B. Negative charge
C. Zero charge
D. One cannot determine the charge’s sign from this diagram.
B. Negative charge
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If the Moon rises around 3 A.M., its phase must be
A) full. B) first quarter. C) third quarter. D) waning crescent. E) waxing crescent.
Study this H-R diagram. Which of the following stars has (or had) the longest hydrogen fusing lifetime? (The red arrows help you locate these stars on the diagram.)
A) Barnard's star B) Alpha Centauri B C) Betelgeuse D) the Sun
The satellite most critical to the study of the formation and structure of the universe is ________, which detected the ripples that led to galaxies
A) WMAP B) Fermi C) Planck D) HST E) COBE
For this situation, I push on a heavy chair.Suppose I push lightly on the chair, and the chair doesn't move at all. Then the strength of the force the chair exerts on me is
a. less than the force I exert on the chair. b. equal to the force I exert on the chair. c. greater than the force I exert on the chair. d. zero.