Where is the center of mass of the Earth-Moon system?
a. Near the Moon.
b. In Australia.
c. Not very far above the surface of the Earth.
d. Halfway between the Earth and the Moon.
e. Under the surface of the Earth.
e
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Which of these is stated properly?
a. "The temperature of liquid nitrogen is 77 Kelvin.". b. "The temperature of liquid nitrogen is 77 Kelvins.". c. "The temperature of liquid nitrogen is 77 degrees Kelvin.". d. "The temperature of liquid nitrogen is 77 Kelvin degrees.".
If the distance between us and a star is doubled, the apparent brightness is decreased by a factor of four
Indicate whether the statement is true or false
What observational evidence proved that gamma ray bursts do not come from objects in our galaxy?
What will be an ideal response?
What is the sign of these fields’ divergence at point P on each diagram? (Hint: Draw a cross-sectional view of a small div-meter centered on the point in question, and sketch the electric field vectors at the midpoint of each of the div-meter’s four sides in the drawing’s plane. Don’t worry about how we might create such a field. 
A. The divergence is positive. B. The divergence is negative. C. The divergence is zero.