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The energy associated with the atomic bomb explosion over Hiroshima was equivalent to 13 kilotons of TNT. To how many "Hiroshima Bombs" would the metoerite impact have been equivalent?

A meteorite impact has a kinetic energy of 4.5e14

1 atomic bomb = 13 kilotons of TNT

and 1 megaton of TNT = 4.2e15

answer:

this is how i did it..

(4.2e15 megaton)(10^6 ton/1megaton)(1 kiloton/1000 ton)= 4.2e18

(4.2e18 kiloton)(13)=5.46e19

so..4.5e14/5.46e19 =8.24e-6 which is NOT the right answer?

where did i make my mistake? thanks