A block of mass 5.00 kg rests on a horizontal surface where the coefficient of kinetic friction between the two is 0.200 . A string attached to the block is pulled horizontally, resulting in a 3.00 m/s2 acceleration by the block. Find the tension in the string. (g = 9.80 m/s2)
a. 0.200 N
c. 19.8 N
b. 9.80 N
d. 24.8 N
D
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When a cube is inscribed in a sphere of radius r, the length L of a side of the cube is 
. If a positive point charge Q is placed at the center of the spherical surface, the ratio of the electric flux ?sphere at the spherical surface to the flux ?cube at the surface of the cube is
A.
.B.
.C.
D.
.E.
.A white dwarf is always the remnant of a star that ____
a. ejected a planetary nebula b. was a member of a close binary system c. failed to ignite carbon d. failed to ignite helium e. became a red giant has a mass 20 times larger than our Sun
While a rock thrown upward at 50 degrees to the horizontal rises, neglecting air drag, its horizontal component of velocity
A) increases. B) remains unchanged. C) decreases.
Suppose that Mars were located at the same distance from the Sun as Earth, but was otherwise the same. Would it still be colder than Earth? Why or why not?
A) yes, because Mars has fewer clouds than Earth B) yes, because Mars has a much weaker greenhouse effect than Earth C) yes, because Mars has less gravity than the Earth D) no, because with the same distance from the Sun, the two planets would have the same temperature