In bicycling, each foot pushes on the pedal for half a rotation of the pedal shaft; that foot then rests and the other foot takes over. During each half-cycle, the torque resulting from the force of the active foot is given approximately by τ = τ 0 sin ωt , where τ 0 is the maximum torque and ω is the angular speed of the pedal shaft (in s −1 , as usual). A particular cyclist is turning the pedal shaft at 70.0 rpm, and at the same time τ 0 is measured at 38.5 N·m. Find (a) the energy supplied by the cyclist in one turn of the pedal shaft and (b) the cyclist’s average power output.
In bicycling, each foot pushes on the pedal for half a rotation of the pedal shaft; that foot then rests and the other foot takes over. During each half-cycle, the torque resulting from the force of the active foot is given approximately by τ = τ 0 sin ωt , where τ 0 is the maximum torque and ω is the angular speed of the pedal shaft (in s −1 , as usual). A particular cyclist is turning the pedal shaft at 70.0 rpm, and at the same time τ 0 is measured at 38.5 N·m. Find (a) the energy supplied by the cyclist in one turn of the pedal shaft and (b) the cyclist’s average power output.
In bicycling, each foot pushes on the pedal for half a rotation of the pedal shaft; that foot then rests and the other foot takes over. During each half-cycle, the torque resulting from the force of the active foot is given approximately by τ = τ0 sin ωt, where τ0 is the maximum torque and ω is the angular speed of the pedal shaft (in s−1, as usual). A particular cyclist is turning the pedal shaft at 70.0 rpm, and at the same time τ0 is measured at 38.5 N·m. Find (a) the energy supplied by the cyclist in one turn of the pedal shaft and (b) the cyclist’s average power output.
suggest a reason ultrasound cleaning is better than cleaning by hand?
Checkpoint 4
The figure shows four orientations of an electric di-
pole in an external electric field. Rank the orienta-
tions according to (a) the magnitude of the torque
on the dipole and (b) the potential energy of the di-
pole, greatest first.
(1)
(2)
E
(4)
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