A lift is moving up with an acceleration of $3.675 \mathrm{m} {\mathrm{s}}^{-2}$. The weight of a man (assume $g=9.8 \mathrm{m} {\mathrm{s}}^{-2}$)

A uniform sphere of weight $w$ and radius $3\mathrm{ }\mathrm{m}$ is being held by a string of length $2\mathrm{ }\mathrm{m}$, attached to a frictionless wall, as shown in the figure. The tension in the string will be:

n-blocks of different masses are placed in contact on a frictionless inclined plane as shown in the figure. They are released at the same time. The force of interaction between ${(n-1)}^{th}$ and $n^{th}$ blocks is