A 13g bullet traveling 221 ms penetrates a 2 kg block of, Ask an Expert

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Q. At a distance of 3.7 m from a siren, the sound intensity is 2.80 10-2 W/m2. Assuming that the siren radiates sound uniformly in all directions, find the total power radiated.

Q. A 13 g bullet traveling 221 m/s penetrates a 2.0 kg block of wood and emerges cleanly at 160 m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges?

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