Work done by a 15-Newton force at 140 degrees

[Shayna]

Physics work problem -- mastering physics

Homework Statement

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

Homework Equations

W=\vec F\cdot\vec s=\left|\vec F\right|\left|\vec s\right|\cos \theta

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."

 

[woosh9013]

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.

 

[Shayna]

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