The blades of a windmill are 20 m in length and rotate at a speed of 4 rpm on a typical day.

Question

a) Determine the exact angular velocity of the blades in radians per second.

b) What distance does the tip of a blade travel in 2.5 minutes, to the nearest metre?

Answer 1

Answer 2

4rpm=1440deg/m=1440/(180/pi)=1440/57.295=25.132..........rad/m;/60=.04188.........rad/s.

d*pi=circ; 40pi=125.663.........mtr=1rev;

4rpm=502.654........mtr; distance/minute.

*2.5m=1256.637.......mtr.