$5)$ A horizontal steel brace is $64$ mm in diameter and $6$ m long. How much does the stress in the brace increase if the brace is restricted from expanding and the temperature increases by $170\backslash$deg C$?$ For steel, E $=210$ GPa $(5)$

$6)$ When radiation strikes a substance, three things can happen. What are they? $(3)$

$7)$ A brick wall measures $2\mathrm{.}5$ m high by $9$ m long by $12$ cm thick. Inside the temperature is $22\backslash$deg C and outside the temperature is $-35\backslash$deg C$.$ How much heat will be lost through the wall in $12$ hours? $(5)$

$8)$ A rectangular shack is $4$ m tall. The walls have lengths of $4$ m and $8$ m$.$ The walls are wooden and are $146$ mm thick. Each of the long walls has two windows installed that are $1$ m x $0\mathrm{.}6$ m and $15$ mm thick. If no heat loss occurs through the ceiling or the floor, how much heat will the furnace have to deliver per hour to keep the room at a steady $22\backslash$deg C if the outside air temperature is $-20\backslash$deg C$?(20)$