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## Homework Statement

http://img32.imageshack.us/img32/1551/filevno.jpg [Broken]

I have to find the tension for the rope when angle is 20 degrees, the object is moving back and forth. I know the mass is 2kg, gravity is 10N/kg

## Homework Equations

F_t * cos θ = mg.

So F_t = mg/cos θ

## The Attempt at a Solution

The problem seemed trivial, but I wanted to make sure I got it right: Using F_t = mg/cos θ

F_t = 2*10/cos θ = 20/cos20 = 21.3 N

Is this right or wrong?

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