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Physics 24 Online
OpenStudy (anonymous):

If one micrometeorite (a sphere with a diameter of 1.50 10-6 m) strikes each square meter of the Moon each second, how many years would it take to cover the Moon to a depth of 1.50 m? (Hint: Consider a box on the moon 1.00 m on a side and 1.50 m deep, and find how long it will take to fill the box.)

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