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