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Q. A drill starts from rest. After 3.20 s of constant angular acceleration, the drill turns at a rate of 2628 rad/s.

a. Find the drill's angular acceleration.

b. Determine the angle through which the drill rotates during this period.

Q. A source produces sound waves of time period .001 second and wave length of 20 cm. calculate the time taken by sound waves to travel a distance of 800 metres.

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