# Check Vector Work: Physics Problem Help

• phunphysics2
In summary, the conversation involves a request for someone to check their work on a physics problem involving vectors and angles. The person providing the summary has determined that the angles provided in the attached pictures are mostly correct, with one error in the last angle. They also mention that the components of the first three vectors are calculated correctly and the overall approach to solving the problem seems correct. The original requester thanks the person for their response and acknowledges the mistake in their angle calculation.

#### phunphysics2

I was wondering if someone could please check my work for this problem. I attached pictures of my work and the problem. It involves vectors.

My instructor said we will be having a problem like this on our exam, and it is an even problem so I'd definitely like to know if I am okay for this problem or not. Thanks for all the help!

If I decipher your handwriting correctly, you have determined the absolute angles to be 25, 100, 250 and 320 degrees. The last one is wrong. Observe that "-y" corresponds to 3 x 90 = 270 degrees, 40 degrees counterclockwise from -y would be 270 + 40 = 310 degrees.

Greetings Voko,

Thank you VERY much for your response. And yes I do certainly see why that should be 310 degrees and NOT 320 degrees. Other than that, do you think my work looked reasonably well? Was I on the right track to solvong it other than that angle error? I apologize for the handwiriting. I will try to write bigger and cleaner next time.

The components of the first three vectors are calculated correctly. As far as I can tell, you then sum them component-wise, thus getting the components of the resultant vector, then you determine its magnitude and angle. All that seems correct.