Physics question regarding energy and moment of inertia
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Physics question regarding energy and moment of inertia

[From: ] [author: ] [Date: 12-04-14] [Hit: ]
What is the average power output?I need help for this part.I think I may need to use the formula P=torque*omega but Im not sure.any help or advice would be appreciated-A) The energy stored is E = I*ω²/2. The moment of inertia is I = m*r²/2 and the angular speed is ω = 2*π*f where f = 340/60 (from rpm to hertz).B) The power is P = ΔE / Δt and ΔE = I/2*(ωf² - ωi²).......
Part A)
Find the energy stored in the solid flywheel of mass 8.0×10^4 kg and radius 1.8 m when it's rotating at 340 rpm.

For this part I got 8.2*10^7

Part B)
The wheel is attached to an electric generator and the rotation rate drops from 340 rpm to 280 rpm in 2.0 s. What is the average power output?

I need help for this part.
I think I may need to use the formula P=torque*omega but I'm not sure.

any help or advice would be appreciated

-
A) The energy stored is E = I*ω²/2. The moment of inertia is I = m*r²/2 and the angular speed is ω = 2*π*f where f = 340/60 (from rpm to hertz).
B) The power is P = ΔE / Δt and ΔE = I/2*(ωf² - ωi²).
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