# Homework Help: How much work is done? (Frictionless plane, xy coodrinates)

1. Oct 15, 2009

### TheSnacks

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

A coin slides over a frictionless plane and across an xy coordinate system from the origin to a point with xy coordinates (1.5 m, 4.5 m) while a constant force acts on it. The force has magnitude 7.8 N and is directed at a counterclockwise angle of 105° from the positive direction of the x axis. How much work is done by the force on the coin during the displacement?

2. Relevant equations

I used the equation Fxdx + Fydy = W

3. The attempt at a solution

I used cosine and sine to find the x and y components of the Force. And the x and y coordinates for the displacement were already given. I figured everything would work when I plug those in, but I had no luck. Any idea what I did wrong?

2. Oct 15, 2009

### Donaldos

What did you do exactly?

3. Oct 15, 2009

### zack_21

If you give what you did exactly, and what answers you got it would be easier to help you. You have the right idea, just aren't executing it properly.

4. Oct 15, 2009

### TheSnacks

Thanks for trying to help - sorry for the lack of information. But I figured it out.