subject
Physics, 17.12.2019 02:31 kiasiab17

Apulley of radius r has a string wrapped around it. a force is applied to the free end of the string such that the string has a tension t. assume that the pulley is rotating with constant angular velocity in the counter-clockwise direction (this could be accomplished by a frictional force which is counteracting the torque due to the string). convince yourself that while the pulley rotates by an angle θ a point on the boundary of the pulley moves by the distance d=rθ. therefore the work done by the tension force on the pulley is given by w=td=trθ.

a. what is the torque τ on the pulley due to the tension in the rope?

b. rewrite the expression for the work done on the pulley by the rope (given above) using your expression for the torque τ. the formula you obtain is the general formula for the work done by a torque on a rotating object. explain why it can be said that this formula is analogous to the formula for work done by a force for linear motion.

ansver
Answers: 1

Other questions on the subject: Physics

image
Physics, 22.06.2019 12:10, lks715
Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)
Answers: 3
image
Physics, 22.06.2019 20:00, rosepotato789
Choose a realistic problem for which these are the correct freebody diagrams. be sure that the answer that the problem requests is consistent with the diagrams shown. choose a realistic problem for which these are the correct freebody diagrams. be sure that the answer that the problem requests is consistent with the diagrams shown. a 1.0 kg block is placed on top of a 2.0 kg block. a horizontal rope pulls the 2.0 kg block across a frictionless floor with a force of 21.0 n. the coefficient between the two blocks is 0.75. does the 1.0 kg block on top slide?
Answers: 3
image
Physics, 22.06.2019 20:30, carson9373
What are some important factors to consider when choosing a warm-up before your workout?
Answers: 2
image
Physics, 23.06.2019 00:10, leapfroggiez
Acar of mass 800kg is moving at a speed of 2.2m/s.
Answers: 1
You know the right answer?
Apulley of radius r has a string wrapped around it. a force is applied to the free end of the string...

Questions in other subjects:

Konu
Physics, 18.08.2019 04:10