i$.$ State three ways in which heat may be transmitted

$[3]$

ii$.$ Determine the force in cables AB and AC necessary to support the $12$ kg traffic light.

$[10]$

iii. The volume of a certain gas is $2\mathrm{.}4m^3$ at a pressure of $125$ kPa and a temperature of $20C.$ Calculate the final temperature in $C$ if the volume of the gas is reduced to $1\mathrm{.}1m^3$ by a pressure of $600$ kPa $.[7]$