Question

An electric motor rotates a wheel at a constant angular velocity 10rps while opposing torque is10Nm. The power of that electic motor is.....

1)120W 2)628W 3)314W 4)3.14W​

Answer 1

First calculate angular velocity. Which is w(omega)=2xpixN(rps)
W=2x3.14x10=62.8rad/s
Power in rotation=[Torque]x[Angular velocity]
P=10Nmx62.8rad/s
P=628W