A block is sliding on a rough horizontal surface. If the contact force on the block is `sqrt2` times the frictional force, the coefficient of friction is

A block is in limiting equilibrium on a rough horizontal surface. If the net contact force is sqrt(3) times the normal force, the coefficient of static friction is

A block is in limiting equilibrium on a rough horizontal surface. If the net contact force is sqrt(3) times the normal force, the coefficient of static friction is

A block is in limiting equilibrium on a rough horizontal surface. If the net contact force is sqrt3 times normal force, the coefficient of static friction is

A block of mass m is placed on a rough horizontal surface. If minimum force to pull the block is (mg)/(2) then coefficient of friction is :