Each second, the burning Sun's mass
A) decreases.
B) increases.
C) remains unchanged.
Answer: A
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Three particles are placed in the xy plane. A 40-g particle is located at (3, 4) m, and a 50-g particle is positioned at (?2, ?6) m. Where must a 20-g particle be placed so that the center of mass of this three-particle system is located at the origin?
A. (?1, ?3) m B. (?1, 2) m C. (?1, 12) m D. (?1, 7) m E. (?1, 3) m
Consider a sample of water at 6°C. If the temperature is slightly increased, the volume of water
1) increases. 2) decreases. 3) remains unchanged. Suppose the water is cooled instead to 3°C. Then further cooling of it will cause its volume to 4) increase. 5) decrease. 6) remain unchanged.
What distance method is used to determine the distance to the most distant galaxies when only a redshift is measured?
a. Hubble's law b. supernova observations c. period-luminosity relationship of variable stars d. parallax
A balloon is buoyed up with a force equal to the
a. density of the surrounding air b. atmospheric pressure c. weight of the balloon and its contents d. weight of the air it displaces