4-37 Force System Resultant Moments Chapter 4 (Hibbeler Statics 14th Edition) Engineers Academy

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Engineering Statics by Hibbeler 14th Edition
Chapter 4: Force System Resultants
Force System Resultant Moment

4–37. Determine the moment of force F about point O.
The force has a magnitude of 800 N and coordinate direction
angles of a = 60, b = 120, g = 45. Express the result as
a Cartesian vector.

Moment about a point
Moment of a force

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[DavidHenryAbeikuBrown]

The cross product for i seems incorrect

[kafukwamekemeh]

Umm sir at 4:25
why is it now -(-0.3*-400)