Posted by Jas on Tuesday, April 5, 2011 at 5:42am.
An object is acted by 3 coplanar forces:30 newton to the north, 20 in the direction S20degrees E and 25 newton in a direction W20degrees S.Find the resultant

physics  Henry, Wednesday, April 6, 2011 at 10:53pm
S20DegE = 290Deg CCW.
W20DegS = 200Deg CCW.
X = hor. = 25cos200 + 20cos290,
X = 23.49 + 6.84 = 16.65N.
Y = ver. = 30 + 25sin200 + 20sin290,
Y = 30  8.55  18.79 = 2.66N.
tanA = Y/X = 2.66/16.65 = 0.1596,
A=9.07Deg = 9.07 +180 = 170.9Deg,Q2.
R = X/cosA = 16.65 / cos170.9 = 16.9N.
@ 170.9Deg.
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