QUESTIONS ON CHAPTERS V. VI. AND VII. 37 



22. Explain how the centre of gravity of a metal plate can be found by 

 balancing it in different positions on the horizontal edge of a ruler. Show 

 that the ruler does not always divide the plate into two parts whose weights 

 are equal. 



23. Explain fully what you understand by the centre of gravity of a 

 body. 



A sheet of cardboard of uniform thickness in the form of an equilateral 

 triangle of 10 inches side is folded along the line joining the middle points 

 of two sides, so as to bring one vertex to the middle point of the opposite 

 side. Through what distance is the centre of gravity of the cardboard 

 moved by the folding ? 



