Question

A helicopter blade spins at exactly 1/4 revolution in 1/2 second .its tip us 5 m from the center of rotation . calculate the average speed and average velocity of the blade tip and win by two seconds with respect to the ground in metre/ sec

Answer 1

a) Average speed = Distance travelled / time elapsed

Distance travelled = 5 × 2 × 3.142 (2πr) = 31.42

Time elapsed = 0.5s

Revolution = 0.25

CALCULATIONS :

(31. 42 /0.5) × 0.25 =15.71 m/s

B.) in 2 seconds

Revolution will be :

0.25 -—> 0.5 s

? —> 2s

(2/0.5) × 0.25 = 1

It makes 1 revolution.

In one revolution, it goes back to the same position hence the displacement is 0.

At 0 displacement V = 0

Answer 2

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