# Homework Help: Calculating Tension

1. Dec 8, 2008

### Jim4592

1. The problem statement, all variables and given/known data
All i was given on the problem was find the tension in each cord in the figure below.

http://img181.imageshack.us/img181/6417/physicsproblemua3.th.jpg [Broken]

2. Relevant equations
Calculate the tension in each cord below.

3. The attempt at a solution

T(C) = W

I know you have to use trigonometry to find the tension in A & B, but without any numbers being given i can't figure anything out.

Last edited by a moderator: May 3, 2017
2. Dec 8, 2008

### Jim4592

sorry about the image, but it was the only way i could include the diagram. You are able to click it to make it bigger

3. Dec 8, 2008

### LowlyPion

You have enough to solve it in terms of W.

Evaluate the vector components in the x,y direction.

They yield 2 equations in T1 and T2. (In terms of W that is.)

4. Dec 8, 2008

### Jim4592

Tc = w

By = Sin(45)*B

Ay = Sin(30)*A

Is that all you would have to do to solve the problem?

5. Dec 8, 2008

### LowlyPion

That would be a no.

Since the system is static the sum of the y components of the tensions = W
And since it is balanced left to right then the x components add to 0.

6. Dec 8, 2008

### Jim4592

so if By+Ay+C = W

and

Ax-Bx = 0

then

A would be equal to: (w-c-sin(45)B) / sin(30)

and B is: (w-c-sin(30)A) / sin(45)

I know there has to be one more part to the solution because even though if you know w, you know c, you still would have one additional variable that's unknown.

7. Dec 8, 2008

### drumjunkie

I don't understand how this website works! =/

8. Dec 8, 2008

### LowlyPion

There is no C.

C is W.

Yielding equations such that

1/2*T1 + (√2/2)*T2 = W

And

(√3/2)*T1 = (√2/2)*T2

9. Dec 8, 2008

### LowlyPion

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