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## Homework Statement

Determine the magnitude of the moment of the force F about the axis CA of the tripod

ABCD, if F = {40i -30j -100k}N.

Image attached.

**2. The attempt at a solution**

Based on a similar question I found in the textbook my method to solve this question:

Find U

_{CA}=

**r**

_{CA}/

*r*

_{CA}= (-2/√8)i + (2/√8)j

Find M

_{CA}= U

_{CA}.(

**r**

_{DC??}* F)

However, I am unsure if the finding the position vector

**r**

_{DC}is correct?

Am I going about this the right way?

Please help.

Thanks,

Tim