A weed trimmer for landscaping has a rotating head which consists of a spool of exible cord, with a strand of cord that extends out from the edge. The spool has an inner diameter of 3.00 cm and an outer diameter of 18.0 cm, and a mass of 100 g. The strand has a length of 16.0 cm. The exible cord has a linear density of 10.0 g/m. 18.0 cm (a) when switched on, the trimmer speeds up from 0 to 2,250 rev/min in 0.175 5. What average power (in W) is delivered to the head by the trimmer motor while it is accelerating? (Round your answer to at least one decimal place.) 73.3 x How is power related to work? What is the change in kinetic energy? What is the moment of inertia of the head? The spool can be modeled as a hollow cylinder. The strand can be modeled as a thin rod, but note the axis of rotation is a distance from the strand. What does the parallel axis theorem say? Be sure to convert all units to SI units. w (b) when the trimmer is cutting weeds, it spins at 2,100 rev/mln and the weeds exert an average tangential force of 6.15 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 (in W) delivered to the head under load? W