What do all four ring systems have in common?
What will be an ideal response?
They are made of small debris orbiting in the equatorial place of Jovian planets, and within their Roche Limit.
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Radioactive Decay: A radioactive substance containing 4.0 × 1016 unstable atoms has a half-life of 2.0 days. What is its activity (in curies, Ci) after 1.0 day? (1 Ci = 3.70 × 1010 Bq)
Fill in the blank(s) with the appropriate word(s).
All the following statements about Mars are true. Which one might have led to a significant loss of atmospheric gas to space?
A) The axis tilt of Mars is thought to change significantly with time. B) Mars lost any global magnetic field that it may once have had. C) Outgassed water molecules are split apart, and the oxygen then reacts chemically with surface rock on Mars. D) Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.
How much work must be done by frictional forces in slowing a 1000-kg car from 26.1m/s to rest?
A) 4.09 × 105 J B) 3.41 × 105 J C) 2.73 × 105 J D) 4.77 × 105 J
Classify the following statement as a characteristic
(a) of electric forces only, (b) of magnetic forces only, (c) of both electric and magnetic forces, or (d) of neither electric nor magnetic forces. The force exerted on a moving charged object is zero.
1.electric forces 2.magnetic forces 3.both electric and magnetic forces 4.neither electric nor magnetic forces