(a) When switched on, the trimmer speeds up from 0 to 2 700 rev/min in 0.200 s. What average power is delivered to the head by the trimmer motor while it is accelerating? w (b) When the trimmer is cutting grass, it spins at 1 930 rev/min and the grass exerts an average tangential force of 6.80 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? w
(a) When switched on, the trimmer speeds up from 0 to 2 700 rev/min in 0.200 s. What average power is delivered to the head by the trimmer motor while it is accelerating? w (b) When the trimmer is cutting grass, it spins at 1 930 rev/min and the grass exerts an average tangential force of 6.80 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? w
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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
Transcribed Image Text: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 shown in the figure below. 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.
-16.0cm
+3.00 cm
18.0 cm
(a) When switched on, the trimmer speeds up from 0 to 2 700 rev/min in 0.200 s. What average power is delivered to the head by the trimmer motor while it is accelerating?
W
(b) When the trimmer is cutting grass, it spins at 1 930 rev/min and the grass exerts an average tangential force of 6.80 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?
W
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