ade 1312946 A typical hekcopter with four blades rotates at 250 rpm and has a ki

Question

ade 1312946 A typical hekcopter with four blades rotates at 250 rpm and has a kinotic enrgy of s.65 x 10 3. What is the total moment of inertia of the bHades? kiotic enegy of 3.65 × kg m2 Readng A baseball pitcher throws the ball in a motion where there is ebow jtent 21 forearm about the ebow joint as well as other movements. If the linear velocity of the ball relative to the moment of inertia of the frearm is 0.5 kg·m·what is the rotational kineek energy dthe tream? 1.0m/s at adistance of 0..00 m "rom the-ard Supporting Materials Reading

Explanation / Answer

KE = 1/2 I w2

I = 2 KE / w2

I = 2 KE / (2 pi f)2

= 2 * 3.65 x 105 / ( 2 pi * 250/60)2

= 1.06 * 103 kg.m2

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w = v / r = 21 / 0.400 = 52.5 rad/s

KE = 1/2 I w2 = 1/2 * 0.5 * 52.52

= 689 J

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