Metal rods X and Y of identical cross-sectional area, have lengths 60 cm and 30 cm respectively. They are made of
metals of thermal conductivities λX and λY. They are well-lagged and joined end - to - end as shown in the diagram. One
end of X is maintained at 100ºC and the opposite end of Y is maintained at 0ºC. When steady conditions have been
reached, the temperature of the junction is found to be 25ºC.
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A steel rod of length of twentycm and of cross sectional space of 2cm^2 is heated uniformly from 20 degree celcius to two hundred degree celcius. notice the force in Newtons that has to be applied to forestall the enlargement of the rod. Given: For steel, the constant of thermal linear expansi and Young modulus=20.6*10^6 N/cm^2.
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