# Equilibrium Question

1. May 12, 2009

### Lord Dark

1. The problem statement, all variables and given/known data
Hi again ,, My third Question of the day :
A 250-kg block is supported by a cable attached to a rod of mass 100 kg that can pivot
at the base.
a) Calculate the tension in the tie-rope between the rod and the
wall if it is holding the system in the position shown in Figure.
b) Find the horizontal and vertical forces exerted on the base of
the rod.

2. Relevant equations

3. The attempt at a solution
in the attachment you'll see the forces I assigned to the system ,, is it right ?? or should I have T2 (above mg) ?? if not I think the question will be too easy:
Fnet(x)=Fh-Tcos(20)
Fnet(y)=Fv+Tsin(20)-mg-Mg (but Tsin(20) = mg) so i can get T and Fv and Fh without even using the Torque ,, so any ideas ??

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• ###### Forces.JPG
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2. May 12, 2009

### Shooting Star

Where is the force which is acting along the rod? What balances T(cos 20) in your first diagram?

3. May 12, 2009

### LowlyPion

Consider the sum of the torques about the pivot.

Equilibrium means that they balance.

4. May 13, 2009

### Lord Dark

you mean mg ??

yea I got it ,, i thought at first that T(sin20) = mg but now i know what is my mistake ,, thanks guys