A 10-kg block is pushed across a horizontal surface with a horizontal force of 30 N against a friction force of 10 N. The acceleration of the block is
A) 1 m/s2.
B) 2 m/s2.
C) 5 m/s2.
D) 10 m/s2.
E) none of the above
Answer: B
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The outer core of Earth extends out to a little over halfway to the surface of Earth. The volume of the core is therefore about ________ the volume of Earth.
A. 1/8 B. 1/2 C. 1/64 D. 1/4
The device that spreads light into its component colors in a spectroscope is a
A) prism. B) diffraction grating. C) either of these D) neither of these
The greatest gravitational lensing is produced by the ________ that lie in the centers of massive galaxies
Fill in the blank(s) with correct word
Curve B in Fig. 14-2 represents
A) an underdamped situation. B) an overdamped situation. C) a moderately damped situation. D) critical damping. E) none of the above