Question: Modern wind turbines are larger than they appear, and despite their apparently lazy motion, the speed of the blades tips can be quite high-many times higher than the wind speed. A turbine has blades 59m long that spin at13rpm .
At the tip of a blade, what is the speed?
At the tip of a blade, what is the centripetal acceleration?
A big dog has a torso that is approximately circular, with a radius of 16cm . At the midpoint of a shake, the dog's fur is moving at a remarkable 2.5m/s .
What force is required to keep a 10 mg water droplet moving in this circular arc?
What is the ratio of this force to the weight of a droplet?