Thermo engineering
posted by Justin on .
The driveshaft of a buildingâ€™s airhandling fan is turned at 300 RPM by a belt running on a 0.3mdiameter pulley. The net force applied by the belt on the pulley is 2000 N. determine the torque applied by the belt on the pulley, in N.m, and the power transmitted, in kW.

torque= force*radius
power= torque*angular speed where
angular speed= 300*2PI/60 rad/sec
this will give you power in watts. 
torque=300Nm
power=31.41 Watts 
torque=F*D/2=2000n(0.15m)=300 N*m
Power = Torque*angular speed
=(300 N*m)(300 RPM) (2*PI/60)
=9424 W = 9.42 kW
These are the answers in the back of the text.