A wrench 30cm long lies along the positive y-axis and grips a bolt in the origin. A force is applied in the(adsbygoogle = window.adsbygoogle || []).push({});

direction < 0; 3; -4 > at the end of the wrench. Find the magnitude of the force needed to supply 100J of

torque to the bolt.

how can i solve it?

r=<0,.3,0>

F=<0,3,4>

T= r X F =100

then i solved it by finding the det = 100

|i j k|

|0 .3 0| = 100

|0 3x -4x|

then x = 83.333 N

but the answer is wrong Why???

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# Homework Help: Find the magnitude of the force

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