Three forces A, B, C corresponding to three steel cables are acting on a joint, as shown. Force A=200N is described by (1) 0=45° which is a CCW rotation on the x-z plane from +x, and (2) an angle of depression d=55°. Force B=150N is on y-z plane; h = 2m and v 5m. Force C = -100i-100j+100k N y B 1. Which of the following is closest to the unit vector of force A? 0.406i-0.406j+0.819k 0.679i-0.611j+0.406k 0.406i-0.406j+0.574k 0.406i-0.819j-0.406k
Three forces A, B, C corresponding to three steel cables are acting on a joint, as shown. Force A=200N is described by (1) 0=45° which is a CCW rotation on the x-z plane from +x, and (2) an angle of depression d=55°. Force B=150N is on y-z plane; h = 2m and v 5m. Force C = -100i-100j+100k N y B 1. Which of the following is closest to the unit vector of force A? 0.406i-0.406j+0.819k 0.679i-0.611j+0.406k 0.406i-0.406j+0.574k 0.406i-0.819j-0.406k
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Transcribed Image Text:Three forces A, B, C corresponding to three steel cables are acting on a joint, as shown.
Force A=200N is described by (1) 0=45° which is a CcW rotation on the x-z plane from +x, and (2) an angle of
depression p=55°.
Force B=150N is on y-z plane; h = 2m and v = 5m.
Force C = -100i-100j+100k N
y
A
v
B
h
1. Which of the following is closest to the unit vector of force A?
0.406i-0.406j+0.819k
0.679i-0.611j+0.406k
0.406i-0.406j+0.574k
0.406i-0.819j-0.406k
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