Physics Physics Vector question Help Why is this soo hard????

There are three vectors: A,B,C. Vector A is 70.0 units East of North creating an angle of 28.0 degrees. Vector B is 40.0 units West of North creating an angle of 56.0 degrees. Vector C is 46.8 units straight down South. Their magnitudes are given in arbitrary units. Determine the sum of the three vectors.





a) Give the resultant in terms of components.


Rx = 39.44


Ry = .....?





(b) What is the magnitude of the resultant?





What is the resultant's angle above the +x axis?


.......°








Please help me to do this question. I got Rx = 39.44 by using 70 cos 28 + -40 cos 56 + 46.8 cos 90





help me how to find Ry???????? please


and show me the work also..Thanks :)))))

Physics Physics Vector question Help Why is this soo hard????
I solved it this manner. I'm not very sure of the results.





I think that x axis is W-E and y axis is N-S





Rx = B*cos(56-45) - Asin(28+45) =


= 40*0.981 - 70*0.956 =


= 39.265 - 66.941 =


= -27.676 (27.676 in module)


Ry = A*cos(45-28) - C =


= 70*0.956 - 46.8 =


= 20.141
Reply:-WordsofWisdom's interpretation is wrong.


-"A vector is east of north creating an angle of 28.0 degrees" means it makes an angle of 28 degrees clockwise from the positive y axis. So it's x component is 70sin28, not 70cos28 that you have. Report It