57. On the inclined plane is a weight of 350 g, the upper side of the thread are tied. Her pull parallel to the inclined plane. When a tension force of 2.6 N load evenly glides up the ramp, and at a tension force of 1.5 N uniformly down. To determine the frictional force between the load and the plane and the angle of inclination to the horizontal plane.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)