Two blocks are accelerated across a horizontal frictionless surface as shown. Frictional forces keep the two blocks from sliding relative to each other, and the two move with the same acceleration. If F = 1.2 N and M = 1.0 kg, what is the horizontal component (frictional force) of the force of the small block on the large block?
a.
0.48 N to the right
b.
0.72 N to the right
c.
0.72 N to the left
d.
0.48 N to the left
e.
0.65 N to the left
b
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As ice floats in water, about 10% of the ice floats above the surface of the water. If we float some ice in a glass of water, what will happen to the water level as the ice melts?
a. The water level will rise 10% of the volume of the ice that melts. b. The water level will rise, but not as much as the 10% indicated in answer A. c. The water level will remain unchanged. d. The water level will become lower.
You look at yourself in a plane mirror. If you move away from the mirror and look at yourself again, you now see
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Why do stars have dark lines in their spectra?
A. They simply don't emit light at certain wavelengths. B. The cooler atoms in their surface layers absorb the radiation at some wavelengths. C. Magnetic fields in Earth's atmosphere absorb the radiation at some wavelengths. D. The statement is false. Stars have bright emission lines in their spectra, but no absorption lines.