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5. An asteroid of mass 1.1 x 105 kg must be diverted 7.5 hours before striking the earth.
How can this be done (in other words, how many 100 MT bombs are needed)? If
needed, the radius of the Earth is 6.4 x 10° m and a 100 mega-ton (MT) explosion releases
4.1 x 10" J.

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