Three forces F1, F2 &F3 act from point A(-1,2,1) towards points B, C, and D respectively. Knowing that F1 = F2 = 10kN and F3= 12kN. Find their resultant and its direction cosines. Co-ordinates of points B, C and D are (1,1,2), (2,-2,-1) and (-2,0,2)
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Correct option is
C
7 N making an angle θ=tan
−1
(
4
3
) with negative y-axis
F
3
=
3
2
+4
2
=5N
(Refer to Image)
From figure,
θ=tan
−1
(
4
3
) with negative y-axis
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