# physics

Propeller blade in aeroplane is 2m long if propeller rotates 1800rev/min compute tangential velocity.

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1. Circumference=pi*2r = 3.14 * 4m=12.57 m.

V = 1800rev/min * 12.57m/rev * 1min/60s=
377 m/s.

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Frequency= 1800 rev/min =30 Hz
Angular velocity=
2πn= 2 × 3.14 ×30

V=2×(2×3.14)=376.8 m/s

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3. It is very easy method

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4. r=2m
V=rw
= r2πn
= 2×2×3.14×30
v=376.8 m/s

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5. V=?
Given:
N=1800rev/min,. 1st we need to convert this in rev/sec
Therefore n=30rev/sec
We know that,
V=r2πn
=2×2×3.14×30
=376.8m/s

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