Kepler's first law of planetary motion implies that
a. the planets move at a constant speeds at all points in their orbits.
b. the planets all move around the Earth in elliptical orbits.
c. uniform circular motion is adequate to describe the motion of all planets.
d. planets move in elliptical orbits around the sun.
D
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The largest satellite orbiting a terrestrial planet is ____________________
Fill in the blank(s) with correct word
Which fact about Mars is true?
A. There are no volcanoes on Mars. B. No spacecraft has ever landed on Mars. C. There was never water on the surface of Mars. D. It is always warmer than freezing on Mars surface. E. Mars has a thinner atmosphere than Earth does.
Which of the following types of cloud is found at the highest altitudes?
What will be an ideal response?
If the net force on an object is zero,
a. there must be no forces acting on the object. b. the object must be at rest. c. the object's acceleration must be zero. d. there can be no friction acting on the object.