- #1

ssj2pizza

- 5

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## Homework Statement

Block A is on a table and is connected by a pulley to block B.

Block A has weight

*W*a and block B has weight

*W*b. Once block B is set into downward motion, it descends at a constant speed. Assume that the mass and friction of the pulley are negligible.

Calculate the coefficient of kinetic friction between block A and the table top.

Express your answer in terms of some or all of the variables

*W*a ,

*W*b, and

*g*(the acceleration due to gravity).

## Homework Equations

*f*

*k*=[tex]\mu[/tex]

*k*

*n*

I have gotten this hint (mastering physics problem):

In this problem, blocks A and B are in dynamic equilibrium; their velocities are constant. This means that the net force on each,

*F*net , is equal to zero.

The tension is constant throughout the rope. By setting the sum of the forces acting on both blocks A and B equal to zero, you should be able to obtain two different expressions for the tension in the rope. Set these equal to each other and solve for [tex]\mu[/tex].

## The Attempt at a Solution

I really don't know how to go about starting this. I know the equation above but don't know what to do with it. I feel like I need to know the acceleration. How would I find the tension?

Please help! Thanks!