Solution of task 5.3.12 from the collection of Kepe OE

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5.3.12
The OABC tetrahedron is under the action of forces F1 = F2 = F3 = 10H. Taking the point B as the center of reduction, determine the modulus of the principal moment of these forces, if the length of the edges AB = BC = AC = 2m. (Answer17.3)