Two large blocks of different materials, e$.$g$,$ aluminum and wood, have been sitting in a

room at initial temperature of $25\backslash$deg C$.$ Which of the two blocks will feel colder to be touched

at your finger? Find the contact surface temperature for the two cases, respectively.

Assuming your finger to be at a temperature of $37\backslash$deg C$,\backslash$rho $=1000$ kg$/$ m$3,$ Cp $=4180$ J$/$kgK$,$

and k $=0\mathrm{.}625$ W$/$mK$.$ The thermophysical properties for aluminum are $\backslash$rho $=2702$ kg$/$ m$3,$

Cp $=903$ J$/$kgK$,$ and k $=240$ W$/$mK ; and those for wood are $\backslash$rho $=640$ kg$/$ m$3,$ Cp $=2805$

J$/$kgK$,$ and k $=0\mathrm{.}15$ W$/$mK$.$