The magnitude M of an earthquake is related to the energy E that it releases. The formula is M =  log(E) + 7.5 1.5. Here, the unit of energy is the terajoule, which is one trillion joules. One joule is approximately the energy expended in lifting 3/4 of a pound one foot. One terajoule is approximately the energy produced by burning one million cubic feet of natural gas. (a) What is the magnitude of a 30-terajoule earthquake? (Round your answer to one decimal place.) M =  (b) On September 24, 2013, a quake of magnitude 7.7 struck Pakistan. How much energy was released by that quake? (Round your answer to the nearest whole number.)  terajoules (c) The atomic bomb dropped on Hiroshima released about 60 terajoules of energy. How many such bombs would be needed to produce the energy released by the Pakistan quake from part (b)? (Round your answer to the nearest whole number.)  bombs

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