Suppose that two 3-blade windmills rotate 20 times per minute.....

Question

Suppose that two 3-blade windmills rotate 20 times per minute. What is the difference in linear velocity in miles per hour of the tips of the windmill blade if the larger windmill has 80-foot blades and the smaller windmill has
40-foot blades?

Answer 1

1) determine the circumference

2) multiply by 20

3) multiply by 60

4) subtract