A steel farme `(K=45Wm^(-1)`^(@)C^(-1)` of total length `60cm` and cross section area `0.02cm^(2)` , Forms three side of a square. The free ends are maintained at `20^(@)C` and `40^(@)C` . Find the rate of heat flow through a cross section of the frame.

A steel frame (K=45Wm^(-1)C^(-1)) of total length 60cm and cross sectional area 0.2cm^(2) , Forms three side of a square. The free ends are maintained at 20^(@)C and 40^(@)C . Find the rate of heat flow through a cross section of the frame.

A steel frame (K=45Wm^(-1)C^(-1)) of total length 60cm and cross sectional area 0.2cm^(2) , Forms three side of a square. The free ends are maintained at 20^(@)C and 40^(@)C . Find the rate of heat flow through a cross section of the frame.

A metal frame of total length 50 cm ad croos-sectional area 0.20 cm^(2) froms five sides of a regular hexagon. The free ends are maintained at 20^(@)C and 40^(@)C . Find the rate of heat flow through a cross-section of the frame (K = 50 W//m^(@)C)

Two parallel plates A and B are joined together to form a compound plate . The thicknesses of the plate are 4.0cm and 2.5cm respectively and the area of cross section is 100cm^(2) for each plate. The thermal conductivities are K_(A)=200Wm^(-1) C^(-1) for plate A and K_(B)=400Wm^(-1) C^(-1) for the plate B. The outer surface of the plate A is maintained at 100^(@)C and the outer surface of the plate B is maintained at 0^(@)C . Find (a) the rate of heat flow through any cross section, (b) the temperature at the interface and (c) the equivalent thermal conductivity of the compound plate.

Two parallel plates A and B are joined together to form a compound plate . The thicknesses of the plate are 4.0cm and 2.5cm respectively and the area of cross section is 100cm^(2) for each plate. The thermal conductivities are K_(A)=200Wm^(-1) C^(-1) for plate A and K_(B)=400Wm^(-1) C^(-1) for the plate B. The outer surface of the plate A is maintained at 100^(@)C and the outer surface of the plate B is maintained at 0^(@)C . Find (a) the rate of heat flow through any cross section, (b) the temperature at the interface and (c) the equivalent thermal conductivity of the compound plate.

Two parallel plates A and B are joined together to form a compound plate . The thicknesses of the plate are 4.0cm and 2.5cm respectively and the area of cross section is 100cm^(2) for each plate. The thermal conductivities are K_(A)=200Wm^(-1) ^(@)C^(-1) for the palte B. The outer surface of the plate A is maintainned at 100^(@)C and the outer surface of the plate A is maintained at 100^(@)C . and the outer surface of the plate B is maintained at 0^(@)C. Find (a) the rate of heat flow through any cross section, (b) the temperature at the interface and (c) the equivalent thermal conductivity of the compound plate.

Three copper rods and three steel rods each of length l = 10 cm and area of cross-section 1cm^(2) are connected as shown If ends A and E are maintained at temperatures 125^(@)C and 0^(@)C respectively, calculate the amount of heat flowing per second from the hot of cold function. [K_(Cu) = 400 W//m-K, K_(steel) = 50 W//m-K]

An aluminium rod and a copper rod of equal length 1.0 m and cross-sectional area. 1cm^(2) are welded together as shown in figure. One end is kept at a temperature of 20^(@)C and the other at 60^(@)C Calculate the amount of heat taken out per second from the hot end. thermal conuctivity of aluminium =200Wm^(-1) ^(@)C^(-1) and of copper =390Wm^(-1) ^(@)C^(-1) .