# Homework Help: Static equilibrium problem -- with a pulley

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1. Jul 18, 2015

### J-dizzal

1. The problem statement, all variables and given/known data

2. Relevant equations
sum of forces equal to zero.

3. The attempt at a solution

Last edited: Jul 18, 2015
2. Jul 18, 2015

### TSny

Looks like you left out a moment arm in one of your terms in ΣMA.

3. Jul 18, 2015

### Dr. Courtney

I can't really follow your work computing components of forces and making sure each force contributes to torque.

4. Jul 18, 2015

### J-dizzal

Thank you, i didnt notice the 6in on the pulley at first.
I updated my original post but im still getting the same answer haha.

5. Jul 18, 2015

### TSny

Note that FDBsinθ is a force component, not a moment. What's the moment arm for this force?

6. Jul 18, 2015

### J-dizzal

oh crap sorry, let me finish that equation.
Ok, for the sum of moments i got 830.5 lb, now let me correct the rest of the equations and see what i get for an answer to the magnitude of A.
edit. 880.7 lb
edit2. 1761.5

Last edited: Jul 18, 2015
7. Jul 18, 2015

### TSny

In the ΣMA equation, your last term is -FDB. Is this meant to be there?

8. Jul 18, 2015

### J-dizzal

no its not supposed to be there, ive change it again, ive edited my original post. there is still something wrong with it though...

9. Jul 18, 2015

### TSny

Check your calculation of Ax. Looks like you have it set up correctly, but made some sort of mistake in plugging the numbers in your calculator.

10. Jul 18, 2015

### J-dizzal

thanks.
I got a new HP 300s calculator in the mail today, still getting used to it...