Question Number 137317 by physicstutes last updated on 01/Apr/21
Commented by physicstutes last updated on 01/Apr/21
$$\mathrm{The}\:\mathrm{figure}\:\mathrm{above}\:\mathrm{shows}\:\mathrm{a}\:\mathrm{composite}\:\mathrm{bar} \\ $$$$\mathrm{made}\:\mathrm{of}\:\mathrm{two}\:\mathrm{materials}\:{X}\:\mathrm{and}\:{Y}.\:\mathrm{The}\:\mathrm{end} \\ $$$$\mathrm{of}\:{X}\:\mathrm{is}\:\mathrm{maintained}\:\mathrm{at}\:\mathrm{100}°\mathrm{C}\:\mathrm{and}\:\mathrm{it}\:\mathrm{has} \\ $$$$\mathrm{length}\:\mathrm{of}\:\mathrm{25}\:\mathrm{cm}\:\mathrm{while}\:\mathrm{that}\:\mathrm{of}\:{Y}\:\mathrm{is}\:\mathrm{maintained} \\ $$$$\mathrm{at}\:\mathrm{0}°\mathrm{C}\:\mathrm{with}\:\mathrm{lenght}\:\mathrm{75}\:\mathrm{cm}.\:\mathrm{Find}\:\mathrm{the} \\ $$$$\mathrm{ratio}\:\mathrm{of}\:\mathrm{the}\:\mathrm{thermal}\:\mathrm{conductivities} \\ $$$$\mathrm{of}\:{Y}\:\mathrm{and}\:{X}. \\ $$
Commented by mr W last updated on 01/Apr/21
$${i}\:{don}'{t}\:{think}\:{we}\:{can}\:{determine}\:{this} \\ $$$${without}\:{knowing}\:{the}\:{temperature}\:{at} \\ $$$${the}\:{contact}\:{point}\:{of}\:{both}\:{materials}. \\ $$
Commented by physicstutes last updated on 01/Apr/21
$$\mathrm{thank}\:\mathrm{you}\:\mathrm{sir},\mathrm{that}\:\mathrm{has}\:\mathrm{been}\:\mathrm{my}\:\mathrm{worry}\: \\ $$