On a day wilderness expedition you'll need to heat of water to the boiling point each day. the air temperature will average . you have available canisters of compressed butane fuel, which you'll burn to heat the water. each canister has of butane in it. what is the minimum number of fuel canisters you must bring? the standard heat of formation of butane at is . you'll probably find other data in the aleks data resource.

Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.