A `100 cm` long cylindrical flask with inner and outer diameter `2 cm` and `4cm` respectively is completely filled with ice as shown in the The constant temperature outside the flask is `40^(@)C`
(Thermal conductivity of the flask is `0.693 W// m^(@)C, L_(ice) = 80cal// gm & In 2=0.693)`

A hollow sphere of glas whose external and internal radii are 11 cm and 9 cm respectively is completely filled with ice at 0^@C and placed in a bath of boiling water. How long will it take for the ice to melt completely? Given that density of ice = 0.9 g//cm^3 , latent heat of fusion of ice = 80 cal//g and thermal conductivity of glass =0.002 cal//cm-s^@C .

A hollow sphere of glass whose external and internal radii are 11cm and 9cm respec-tively is completely filled with ice at 0^(@)C and placed in a both of boiling water How long will it take for the ice to melt completely ? Givne that density of ice =0.9g//cm^(3) latent heat of fusion of ice =80 cal//g and thermal conductivity of glass =0.002 cal//cm-s^(@)C .

A long straight cylindrical hollow pipe has inner and outer radii 1 cm and 2 cm respectively. It carries a current 100 A. Calculate the magnetic field at distance (a) 0.5 cm, (b) 1.5 cm and (c) 4 cm from the axis of pipe.

Time in which a layer of ice of thickness 10 cm will increase by 5 cm on te surface of a pond when temperature of the surrounding is -10^(@)C coefficient of thermal conductivity of ice K=0.005((Cal)/(cm-sec-.^(@)C)) and density rho=0.9gram//cm^(3) (L=80cal/g)

For a glass window of area 1500 cm^2 and thickness 0.5 cm, determine the rate of loss of heat if the temperature inside the window is 35^@C and outside is -2^@C . Take, coefficient of thermal conductivity of glass = 2.2 xx 10^(-3) cal s^(-1) cm^(-1) K^(-1)

There is ice formation on a tank of water of thickness 10 cm.How much time it will take to have a layer of 0.1 cm below it ?The outer temperature is -5^(@)C , the thermal conductivity of ice is 0.005 calcm^(-1) ""^(@)C^(-1) and latent heat of ice is 80cal//g and the density of ice is 0.91 gcm^(-3) :

A metallic cylindrical shell of length 50 cm has inner radius of 3 cm and outer radius of 6 cm. If the inner and outer surfaces of the cylinder are maintained at 0^@C and 80^@C , respectively, then find the rate of flow of heat from the outer surface to the inner surface. Take, thermal conductivity of metal = 69.3 Wm^(-1) k^(-1)

Estimate the rate at which ice would melt in a wooden box 2.5 mm thick and of inside measurement 100 cm x 60 cm x 40 cm, assumming that external temperature is 32 .^(@)C and coefficient of thermal conductivity of wood is 0.168 Wm^(-1) K^(-1) . Given L=80 cal//g .

A solid sphere of radius b=4cm has a cavity of radius a=2cm. The cavity is filled with steam at 100^(@)C . The solid sphere is placed inside the ice at 0^(@)C . Thermal conductivity of material of sphere is 0.5 W/m .^(@)C . If ther ate of flow of heat through the sphere radially is x pi J//s then find the value of x.