Solved: The 4-lb pulley has a diameter of 1 ft and the

Chapter 8, Problem 8-120

(choose chapter or problem)

Get Unlimited Answers
QUESTION:

The 4-lb pulley has a diameter of 1 ft and the axle has a diameter of 1 in. If the coefficient of kinetic friction between the axle and the pulley is \(\mu_{\mathrm{k}}\) = 0.20, determine the vertical force P on the rope required to lift the 20-lb block at constant velocity

Questions & Answers

QUESTION:

The 4-lb pulley has a diameter of 1 ft and the axle has a diameter of 1 in. If the coefficient of kinetic friction between the axle and the pulley is \(\mu_{\mathrm{k}}\) = 0.20, determine the vertical force P on the rope required to lift the 20-lb block at constant velocity

ANSWER:

Step 1 of 5

First, we'll draw the free-body diagram of the shaft.

Note that the pulley rotates counterclockwise, so the shaft rotates clockwise relative to the pulley. Therefore the friction force must rotate counterclockwise in order to prevent the rotation.

Add to cart


Study Tools You Might Need

Not The Solution You Need? Search for Your Answer Here:

×

Login

Login or Sign up for access to all of our study tools and educational content!

Forgot password?
Register Now

×

Register

Sign up for access to all content on our site!

Or login if you already have an account

×

Reset password

If you have an active account we’ll send you an e-mail for password recovery

Or login if you have your password back