Question

Size of a matchbox is a "force" to 2.5 cm into 1.5 cm what is the value of the packet contain 144 matchbox

Answer 1

Answer:

First of all calculate linear mass density of chain that is equal to mass/length. next since 1/6 length is hanging the centre of mass will rise to a height of 1/12length on pulling the chain up.next work done =m*g*h=(1/6L*m/L)*g*1/12L=1/72 mgl.