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... ing Neville start to concentrate on organizing his little package, Harry tactfully refrained from asking further. Bored, he looked around at everyone busy with something, and finally, his attention was drawn to a few books spread out on the table by Hermione—
The known mass of the moon is about m=7×1022kg, the distance between the moon and the earth is about r=4×108m, the time it takes for the moon to orbit the earth is about 27.3 days, and the gravitational constant is G=6.67×10−11Nm2/k ...
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