Solving Static Friction Coefficient for Wooden Block on Table

[runningirl]

Homework Statement

A wooden block of mass 29.0 kg sits on a horizontal table. A wire of negligible mass is attached to the right side of the block and goes over a pulley (also of negligible mass, and frictionless), where it is allowed to dangle vertically. When a mass of 15.5 kg is attached to the wire, the block barely starts to slide. What is the coefficient of static friction between block and table?

Homework Equations

f=ma
Ff=coefficient (Fn)

The Attempt at a Solution

Fn=(29+15.5)*9.8?

got stuck after that.

 

[tiny-tim]

hi runningirl!

no, the weight of the block acts on the block only, the weight of the 15.5 kg mass acts on the 15.5 kg mass only …

to find F_normal for the block, consider only the forces on the block (including the tension)