A 30-g lead bullet initially at 20oC comes to rest in the block of a ballistic pendulum.

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A 30-g lead bullet initially at 20oC comes to rest in the block of a ballistic pendulum. Assume that half the initial kinetic energy of the bullet is converted into thermal energy within the bullet. If the speed of the bullet was 420 m/s, what is the temperature of the bullet immediately after coming to rest in the block?

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