Sorry, the 9 is in radians per second, but the problem is I get stuck there. I know I need the linear speed...but I don't how to go about doing that in this situation.
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...