A uniform cable of mass and length is placed on a horizontal surface such that its…

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A uniform cable of mass

M

and length

L

is placed on a horizontal surface such that its

\left(\frac{1}{n}\right)^{\text{th}}

part is hanging below the edge of the surface. To lift the hanging part of the cable upto the surface, the work done should be: (1)

\frac{MgL}{2n^2}

(2)

\frac{MgL}{n^2}

(3)

\frac{2MgL}{n^2}

(4)

nMgL