(a) In the above expression, we set (with SI units understood) x= 0, y= – 4.0, z= 3.0, Fx= 2.0, Fy= 0 andFz= 0. Then we obtain()ˆˆ6.0j 8.0k N m.rFτ=× =+⋅GGGThis has magnitude 22(6.0 N m)(8.0 N m)10 N m⋅+⋅=⋅and is seen to be parallel to theyzplane. Its angle (measured counterclockwise from the +ydirection) is tan.−=°18653bg(b) In the above expression, we set x
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