Solution of task 2.6.9 from the collection of Kepe OE

Solution of task 2.6.9 from the collection of Kepe OE

2.6.9
A horizontal force F = 12 N is applied to a homogeneous rinket roller R = 0,4 m. What should be the smallest weight of the roller in kN so that it is at rest if the rolling friction coefficient is? = 0.008 m, size OA = 0.2 m? (Answer 0.9)