Physics (AS & A Level) · Oct / Nov 2017 · Paper 13 · Question 19

The diagram shows an arrangement used to find the output power of an electric motor. The wheel attached to the motor's axle has a circumference of 0.5 m and the belt which passes over it is stationary when the weights have the values shown. [diagram: motor, wheel, belt, 20 N and 50 N weights] When the wheel is making 20 revolutions per second, what is the output power of the motor?

1. A300 W
2. B500 W
3. C600 W
4. D700 W

As printed in the paper