# Homework Help: Physics work problem - mastering physics

1. Nov 3, 2008

### Shayna

Physics work problem -- mastering physics

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

Find the work W done by the 15-newton force.

2. Relevant equations
W=\vec F\cdot\vec s=\left|\vec F\right|\left|\vec s\right|\cos \theta

3. The attempt at a solution
W= 15*cos140*160 = -1838.506
I don't know why mastering physics was telling me "Not quite. Check through your calculations; you may have made a rounding error or used the wrong number of significant figures."

2. Nov 3, 2008

### woosh9013

Re: Physics work problem -- mastering physics

I don't know if you already figured this out, but the only thing I can think of (and it's not really even related to the error you were getting) is that Mastering Physics requires angle measures to be in radians.

3. Nov 3, 2008

### Shayna

Re: Physics work problem -- mastering physics

yes but that shouldn't be affecting the answer though, cos140degree = cos(14/9)pai
Thanks though

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