ch11-p019 - 19. If we write r = x i + yj + zk, then (using...

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(a) In the above expression, we set (with SI units understood) x = 0, y = – 4.0, z = 3.0, F x = 2.0, F y = 0 and F z = 0. Then we obtain () ˆˆ 6.0j 8.0k N m. rF τ =× = + G GG This has magnitude 22 (6.0 N m) (8.0 N m) 10 N m ⋅+ = and is seen to be parallel to the yz plane. Its angle (measured counterclockwise from the + y direction) is tan . 1 86 53 bg (b) In the above expression, we set x
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