Momentum: A proton, which has a mass of 1.67 × 10-27, is moving at 0.80c relative to the laboratory. What does a physicist in that lab measure for its momentum? (c = 3.0 × 108 m/s)
A. 4.0 × 10-19 kg ? m/s
B. 4.4 × 10-19 kg ? m/s
C. 5.0 × 10-19 kg ? m/s
D. 5.8 × 10-19 kg ? m/s
E. 6.7 × 10-19 kg ? m/s
Answer: E
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You stand on a scale to measure your weight. The reaction to the force the Earth exerts on you is
A. the force the Earth exerts on the scale. B. the force you exert on the Earth. C. the force the scale exerts on you. D. the force you exert on the scale. E. the force the scale exerts on the Earth.
The major problem faced by optical astronomers in trying to deduce the structure of the Milky Way Galaxy is that we can see only a small part of it because of the ________
Fill in the blank(s) with correct word
Areas always have dimensions _____ while volumes always have dimensions _____
a. m2, m3 b. L2, L3 c. Both a and b are correct. d. No answer is correct because of the "always.".
In the figure below, a hoop (radius R = 1.0 m, mass = 2.0 kg) having four spokes of negligible mass is suspended from a pivot a distance d = .25 m above its center of mass. The angular frequency (in rad/s) for small oscillations is approximately
?
?
a.
4.0.
b.
2.5.
c.
1.5.
d.
1.0.
e.
0.5.