For a particular car windscreen wiper mechanism, an electric motor is required that can provide 5 N m of torque at about 35 rpm. A small permanent magnet d.c. motor is suggested as being suitable for this purpose. The manufacturer's data is as follows:
- Stall torque: 0.15 N m
- Stall current: 15 A
- No-load speed: 6000 rpm
- No-load current: 0.5 A
- Supply voltage: 12 V
Show that this motor has the power to do the job, and determine an approximate gear ratio with which it should be used in order to supply the necessary combination of torque and speed.