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Homework Statement
The windmill is 400 feet tall and each of it's three blades are 130 feet long. At how many rpms will a blade tip break the sound barrier? Speed of sound: 1125ft/sec
Homework Equations
Linear speed: v = rω
Angular speed: ω = Θ/Time
The Attempt at a Solution
1125ft/sec = 130ft(ω)
ω = 1125ft/sec * 1rad/130ft ≈ 9