Question1a 23-g bullet travelling 285ms penetrates a 45kg, Ask an Expert

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Question1

A 23-g bullet travelling 285m/s penetrates a 4.5kg block of wood and emerges cleanly at 230m/s. If block is stationary on a frictionless surface while hit, how fast does it move after the bullet emerges?

Question2

A 17 g rifle bullet travelling 215 m/s buries itself in a 3.8 kg pendulum hanging on a 2.5 m long string that makes pendulum swing upward in an arc. Find out the vertical and horizontal components of the pendulum's displacement.

Question3

Two speakers, one straight behind the other, are each generating a 457-Hz sound wave. What is the smallest separation distance between speakers that will produce destructive interference at a listener standing in front of them? Take speed of sound to be 344 m/s.

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Category:- Physics
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