Solution of task 2.1.11 from the collection of Kepe OE

Solution of task 2.1.11 from the collection of Kepe OE

2.1.11
On the lever with the fixed axis O, the forces F1 = 4H and F2 act.
Determine the modulus of the force F2 necessary to keep the lever in equilibrium if the angles? = 45 °,? = 120 °, the lengths AO = 0.5 m, BO = 0.6 m.
(Answer 2.72)