The two blocks shown in the diagram below are connected by an inextensible string of negligible mass, and the mass M$2$ is hanging under the action of gravity. The coe cient of friction between the mass M$1$ and the table is $.($c$)[4$ marks$]$ Find the highest value of for which M$1$ can slide. $($d$)[2$ marks$]$ Does the tension in the string depend on the friction coe cient for $>?$