- #1
Vladi
Homework Statement
A 120-V generator is run by a windmill that has blades 2.0 m long. The wind, moving at 12 m/ s, is slowed to 7.0 m/ s after passing the windmill. The density of air is 1.29 kg/ m3. If the system has no losses, what is the largest current the generator can produce? [Hint: How much energy does the wind lose per second?]
Homework Equations
P=(1/8)(density)(pi)(diameter)^2(v)^3
P=(V)(I)
Speed=Distance/Time
The Attempt at a Solution
I need to figure out the speed of the windmill. Can I determine the speed of the windmill by figuring out how much time it takes to change the speed of the wind? I want to make sure my logic is correct.