A machine gun is mounted on a tank moving at a speed of 20 m s⁻¹ towards a target with the gun pointing in the direction of motion of the tank. The muzzle speed of the bullet equals the speed of sound

Question

A machine gun is mounted on a tank moving at a speed of 20 m s⁻¹ towards a target with the gun pointing in the direction of motion of the tank. The muzzle speed of the bullet equals the speed of sound = 340 m s⁻¹. If, at the time of firing, the target is 500 m away from the tank, then:

TestHub · Accepted Answer

The bullet\'s speed relative to the ground is 340 + 20 = 360 m/s. Sound moves at 340 m/s in air regardless of the source motion. Bullet time = 500/360 = 1.39 s, sound time = 500/340 = 1.47 s. The bullet arrives first, so the sound arrives later.

Physics - Sound Wave Question with Solution | TestHub

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