A Lunar Month Is About 28 Days

question 11

Multiple Choice

A lunar month is about 28 days. If the Moon were closer to Earth than it now is, the lunar month would be

• A)less than 28 days,
• B)more than 28 days,
• C)still 28 days,
• Mainly because
• D)centripetal force would lessen with decreased distance.
• E)a closer Moon means an increase in both gravitational force and speed, which in a smaller orbit means shorter time.
• F)orbital speed about the center of mass of Earth-Moon system is not dependent upon the distance between Earth and Moon.
• G)of tidal friction.

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