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
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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
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
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thanks for free points
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