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A 30-caliber rifle with a mass of 2.94 kg fires a 9.73- g bullet with a speed of 666 m/s with respect to the ground. What kinetic energy is released by the explosion of the gunpowder that fires the bullet? (Note there is a tolerance 0.1 percent for the answer

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The bullet has a KE of 1/2 *.0973*666^2 joules.

Now the energy released by the explosion is much more...hot gases, gases expanding, sound, fireball, and the energy in kickback.
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