$\backslash$table$[[\backslash$table$[[$Problem $3$: Flue gases from an incinerator are released to atmosphere using a stack that is $0\mathrm{.}6$ m in diameter$],[$and $10\mathrm{.}0$ m high. The outer surface of the stack is at $40C$ and the surrounding air is at $10C.$ Determine the$],[$rate of heat transfer from the stack assuming$],[$a$)$ there is no wind $($Answer: $Q=2070W)],[$b$)$ the stack is exposed to $20k\frac{m}{h}$ winds. $($Answer: $Q=8890W)],[$Given:$],[$Asked:$]]$ Assumptions:$]]$