One of the predictions of Kepler's laws of planetary
motion is that
a) the planets move in circular orbits.
b) for a non-circular orbit, the closer a planet is to the Sun the faster it travels.
c) planets nearer the Sun have the longest orbital periods.
d) all planets move in elliptical orbits around Earth.
•
b
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Spheres of Charge: A spherical conductor of radius 2.0 mm carries a charge of 7.1 nC. What is the magnitude of the electrical field at 6.0 mm from the center of the sphere? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 25 × 106 N/C B. 89 × 106 N/C C. 1.8 × 106 N/C D. 780 × 106 N/C E. 0.89 × 106 N/C
What would Earth's average surface temperature be if it had no greenhouse effect?
A) below the freezing point of water B) slightly above the freezing point of water C) about 10°C D) the same temperature as it is with the greenhouse effect E) slightly warmer than it is with the greenhouse effect
Significant amounts of liquid water last existed on the surface of Mars during the
A) Noachian Era B) Amazonian Era C) Hadean Era D) Hesperian Era
There are six books in a stack, each with a weight of 3.0 N. The coefficient of friction between all the books is 0.20 as is the coefficient between the table and the bottom book. What horizontal push must I just exceed on the next to bottom book to start sliding the top five books off the bottom one?
a. 1.0 N c. 3.0 N b. 5.0 N d. 7.0 N