Based on the given densities, which of these jovian moons contain the greatest percentage of rocky material and the smallest percentage of icy material?
A) Callisto (density = 1.86 grams/cc)
B) Europa (density = 2.97 grams/cc)
C) Io (density = 3.57 grams/cc)
D) Ganymede (density = 1.94 grams/cc)
C) Io (density = 3.57 grams/cc)
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If a star has a parallax of 0.05", then its distance in light-years is about
A) 6.4 light-years. B) 12.7 light-years. C) 20 light-years. D) 65 light-years. E) 100 light-years.
The strong force is to gluons as the gravitational force is to
A) Z particles. B) quarks. C) photons. D) gravitons. E) neutrinos.
From a molecular point of view, explain why evaporation is a cooling process. What cools?
What will be an ideal response?
Two identical balls are at rest side by side at the bottom of a hill. Some time after ball A is kicked up the hill, ball B is given a kick up the hill. Ball A is headed downhill when it passes ball B headed up the hill. At the instant when ball A passes ball B,
A. it has the same position and velocity as ball B. B. it has the same position and acceleration as ball B. C. it has the same velocity and acceleration as ball B. D. it has the same displacement and velocity as ball B. E. it has the same position, displacement and velocity as ball B.