What average power is delivered to the head

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Reference no: EM13328999

The head of a grass string trimmer has 100 g of cord wound in a light cylindrical spool with inside diameter 3.00 cm and outside diameter 18.0 cm, as in Figure P10.50. The cord has a linear density of 10.0 g/m. A single strand of the cord extends 16.0 cm from the outer edge of the spool. When switched on, the trimmer speeds up from 0 to 2450 rev/min in 0.210 s.

(a) What average power is delivered to the head by the trimmer motor while it is accelerating?

(b) When the trimmer is cutting grass, it spins at 1960 rev/min and the grass exerts an average tangential force of 8.40 N on the outer end of the cord, which is still at a radial distance of 16.0 cm from the outer edge of the spool. What is the power delivered to the head under load?

Reference no: EM13328999

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