Steam at 373K is passed through a tube of radius 50 cm and length 3m. If thickness of the tube be 2 mm and conductivity of its material be `2xx10^(-4)`/ cal/s-cm-K, the rate of loss of heat in `Js^(-1)` is (The outside temperature is 282K).

Steam at 100^(@)C is passed through a tubeof radius 5 cm and length 3 m. If the thickness of tube be 2 mm and conductivity of its material be 2xx10^(-4)" cal "cm^(-1) K^(-1) s^(-1) , calculate the rate of loss of heat in js^(-1) . The outside temperature is 20^(@)C .

Steam at 373 K is passed through a tube of radius 10 cm and length 10 cm and length 2m . The thickness of the tube is 5mm and thermal conductivity of the material is 390 W m^(-1) K^(-1) , calculate the heat lost per second. The outside temperature is 0^(@)C .

Length of a hollow tube is 5 m , its over diamter is 10 cm and thickness of its wall is 5 mm. If resistivity of the material of the tube is 1.7 xx 10^(-8) Omega xx m then resistance of tube will be

Heat is flowing through a rod of length 25.0 cm having cross-sectional area 8.80 cm^(2) . The coefficient of thermal conductivity for the material of the rod is K = 9.2 xx 10^(-2) kcal s^(-1) m^(-1) .^(@)C^(-1) . The Temperatures of the ends of the rod are 125^(@)C and 0^(@)C in the steady state. Calculate (i) temeprature gradient in the rod (ii) temperature of a point at a distance of 10.0 cm from the hot end and (iii) rate of flow of heat.

16cm^(3) of water flows per second through a capillary tube of radius a cm and of length l cm when connected to a pressure head of h cm of water if a tube of the same length and radius a/2 cm is connected to the same pressure head the quantity of water flowing through the tube per second will be-

An iron boiler is 1 cm thick and has a heating area 2.5 m^(2) . The two surface of the boiler are at 230^(@)C and 100^(@)C respectively. If the latent heat of the steam is 540 kcal kg^(-1) and thermal conductivity of iron is 1.6xx10^(-2)K cal s^(-1) m^(-1)K^(-1) , then how much water will be evaporated into steam per minute ?

If layer thickness L_(2) is 1.4 cm , then its thermal conductivity K_(2) will have value ("in " W//mK)

The external diameter of a 4 m long hollow tube is 10 cm and thickness of its wall is 5 mm. If the specific resistance of the copper is 1.7xx10^(-8)Omega m , then calculate its resistance.

A slab consists of two parallel layers of different materials 4cm and 2cm thick and of thermal conductivities 54cals^(-1)m^(-1)K^(-1) and 36cals^(-1)m^(-1)K^(-1) respectively. If the faces of the slab are at 100^(@)C and 0^(@)C calculate the temperature of the surface dividing the two materials.