1. ## Vectors

Can someone please help me with this problem. Thanks a lot!

Question: You have three vectors, F1=35 w/40 degrees, F2=40 w/25 degrees, F3= 80 w/30 degrees. Find the resultant vector of all three.

What I did: 40 sin 25 + 35 sin 40 = 39.40
40 cos 25 + 35 cos 40 = 63.06
then I divide each of these two number to each other w/ tan inverse and got 2.26 then I am stuck. By the way I did what I did so far is wrong. I am very confuse cause the correct answer was 78.4 and 17.1 degree. Can u please tell me what I did wrong or how to do this problem. Thanks again!

2. Originally Posted by jsu03
Can someone please help me with this problem. Thanks a lot!

Question: You have three vectors, F1=35 w/40 degrees, F2=40 w/25 degrees, F3= 80 w/30 degrees. Find the resultant vector of all three.

What I did: 40 sin 25 + 35 sin 40 = 39.40
40 cos 25 + 35 cos 40 = 63.06
then I divide each of these two number to each other w/ tan inverse and got 2.26 then I am stuck. By the way I did what I did so far is wrong. I am very confuse cause the correct answer was 78.4 and 17.1 degree. Can u please tell me what I did wrong or how to do this problem. Thanks again!
you only added two of the three vectors?

recheck the magnitudes and directions because $\displaystyle F_1 + F_2 + F_3$ is not the "answer" you cite.