A double-pane window consists of two glass sheets each of area 1m^(2) and thickness 0.01m separated by a 0.05 m thick stagnant air space. In the steady state, the room glass interface and the glass outdoor interface are at constant temperature of 27^(@)C and 0^(@)C, respectively. (a) Calculate the rate of heat flow through the [...]

Air is initially at 260^(@)C and 700pa and occupied 0.028m^(3). The air is expanded at constant pressure to 0.084 m^(3). A polytropic process with n=1.5 is then carried out followed by a constant temperature process which complete the cycle. (a) sketch cycle in P-V. (b) find heat received and heat rejected in the cycle. (c [...]

A steel rod with a cross-sectional area of 150 mm^(2) is stretched between two fixed points. The tensile load at 20^(@)C is 5000N. (a) What will be the stress at -20^(@)C ? (b) At what temperature will the stress be zero ? (Assume alpha=11.7mu m//m^(@)C and Y=200GN//m^(2)) Cubical expansivity of benzene =1.2xx10^(-3)K^(-1) Cubical expansivity of [...]

Using the following data, find the change in temperature at which wood will just sink in benzene. Density of benzene at 0^(@)C=9xx10^(2)kgm^(-3), Density of wood at 0^(@)C=8.8xx10^(2)kgm^(-3), Cubical expansivity of benzene =1.2xx10^(-3)K^(-1) Cubical expansivity of wood =1.5xx10^(-4)K^(-1) Cubical expansivity of benzene =1.2xx10^(-3)K^(-1) Cubical expansivity of wood =1.5xx10^(-4)K^(-1) Density of wood at 0^(@)C=8.8xx10^(2)kgm^(-3) find the change [...]