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# show that if r and F lie in a given plane, the torque = r x F has no component in that plane?

Show that, if r and F lie in a given plane, the torque, t = r x F, has no component in that plane.

Thanks

### 1 Answer

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- Al PLv 71 decade agoFavorite Answer
The vector product T = r X F is defined to

be in a direction perpendicular to the plane

formed by "r" and "F".

Example:

A = 5.1i , -8.4j ,0k

B = 7.4i , 6.3j , 0k

C = A X B = 0i , 0j , 94.29k -->z-axis

No component in the xy plane.

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