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The period of revolution of the moon around the earth is 27.3 days. Rememberthat this is the period with respect to the fixed stars (the period of revolutionwith respect to the moving earth is about 29.5 days; it is this period that isused to fix the duration of a month in some calendars). The radius of moon’sorbit is 3.84 × 10^8m (60 times the earth’s radius). Calculate the centripetalacceleration of the moon and show that it is very close to the value given by9.8 ms–2 divided by 3600, to take account of the variation of the gravity as 1/r2 |
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