In Figure $6-42$ we see two blocks connected by a string and tied to a wall. The mass of the lower block is $1\mathrm{.}0$ kg; the mass of the upper block is $2\mathrm{.}0$ kg$.$ Given that the angle of the incline is $31,$ find the tensions in $($a$)$ the string connecting the two blocks and $($b$)$ the string that is tied to the wall.