Over the course of a year:
A) the Moon revolves once about its axis.
B) the Earth completes one revolution about its axis.
C) the Moon completes one revolution around the Earth.
D) the Earth completes one orbit around the Sun.
E) the rotation axis of the Earth drifts away from Polaris and back again.
Ans: D) the Earth completes one orbit around the Sun.
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Claudius Ptolemy created an elaborate geometrical and mathematical model to explain details of the observed motions of the planets while assuming:
A) Earth was motionless at the center of the Universe. B) the Sun was at the center of the Universe. C) Earth was part of a galaxy. D) there were many galaxies in the Universe.
Seasonal variations on Mars are due
A) only to its changing distance from the Sun B) only to its axis tilt C) to changes in the amounts of energy emitted by the Sun D) both to its axis tilt and its changing distance from the Sun
A uniform rope hangs from a ceiling. Without tugging on the rope, you give the bottom of the rope a wiggle and a wave travels upward along the rope. What can you say about the speed of the wave as the wave travels up the rope?
What will be an ideal response?
If the mass of Mars is 0.107 times that of Earth, and its radius is 0.530 that of Earth, estimate the gravitational acceleration g at the surface of Mars. (gearth = 9.80 m/s2)
a. 2.20 m/s2 b. 3.73 m/s2 c. 4.20 m/s2 d. 5.50 m/s2