An object of weight 10 N rests on an incline which is at 30° to the horizontal. What are the components of this weight in a direction at right angles to the incline and parallel to the incline? A...

An object of weight 10 N rests on an incline which is at 30° to the horizontal. What are the components of this weight in a direction at right angles to the incline and parallel to the incline?

A homogeneous rod has a length of 200 mm and a uniform crosssection of 20 mm × 30 mm. At what point is the centre of gravity?