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## Homework Statement

A beam of 12[kN] is on a smooth floor on one side and on a rough edge on the other.

The total length of the beam is 10[m].

What is the reaction on the edge.

## Homework Equations

Moments (torque): F

_{1}L

_{1}=F

_{2}L

_{2}

## The Attempt at a Solution

I drew the forces. the reaction on the floor is vertical and also on the edge since there aren't horizontal forces.

Moments around point A:

$$12[kN]\cdot 5\cdot \cos 30^0=R\cdot\frac{4[m]}{\tan 30^0}\rightarrow R=7.5[kN]$$

In the book it's 6.5, i think it's a mistake