Solution of task 5.3.9 from the collection of Kepe OE

If the total amount of your purchases from the seller Михаил_Перович more than:
- 200 $ the discount is 15%
- 100 $ the discount is 10%
- 50 $ the discount is 7%
- 20 $ the discount is 5%
- 10 $ the discount is 3%
- 5 $ the discount is 2%
- 1 $ the discount is 1%

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5.3.9
The forces F1 = F2 = 6H, F3 = 3Н act on the cube with the edge a = 0.8 m. Determine the modulus of the principal moment of these forces, choosing the point O for the center of reduction (Answer 3.54)