The difference in temperature between two sides of a glass plate 0.3 mm thick is `25^@C`. If the area of one side surface is `10 m^2`, calculate the heat conducted per second through the plate. The thermal conductivity of glass is `0.84 J//s` m K.

Find the temperature difference between two sides of a steel plate 4 cm thick, when heat is transmitted through the plate at the rate of 400 kcal per minute per square metre at steady rate. Thermal conductivity of steel is 0.026 kcal//m.s. k .

The temperature difference between two sides of an iron plate, 2 cm thick, is 10^@ C . Heat is transmitted through the plate at the rate of 600 kcal per minute per square metre at steady state. Find the thermal conductivity of iron.

Calculate the rate of loss of heat through a glass window of area 1000 cm2 and thickness of 4 mm, when temperature inside is 27^@ C and outside is -5^@ C . Coefficient of thermal conductivity of glass is 0.022 cal/ s cm^@ C.

A drop of water placed between two parallel glass plates which are then pressed together unil the water film is 0.01 cm thick. If the area of water in contact with either plate is 10 cm^2 , then the force due to surface tension drawing the plates together is (S.T. of water is 75 dyne/ cm)

The thermal conductivity of steel is 0.026 k cal//ms K. Find the temperature diference between two sides of a steel plate 4 cm thick, when heat is transmitted through the plate at the rate of 400 k cal per minute per squar metre of steady state.

When holes are dug into the Earth, it is found that for a depth of every 30 m, the temperature rises by 1^@C . If the coefficient of conductivity of Earth's crust is 0.8 watt//m^@k , calculate the amount of heat flowing through an area of 1 sq. metre on surface of earth, per minute

The thermal conductivity of a metal plate is 80 w//mk . If the thickness of the plate is 0.5 cm and heat is conducted at the rate of 2.5 xx 10^6 W//M^2 . The temperature difference across the two faces of the plate is about

A deep rectangular pond of surface area A, containing water ( density =p, specific heat capacity =s ) is located in a region where the outside air temperature is at a steady value of 26^@C . The thickness of the frozen ice layer in this pond, at a certain instant is x. Taking the thermal conductivity of ice as K, and is specific latent heat of fusion as L, the rate of increase of the thickness of ice layer, at this instant, would be given by

A thin liquid film of thickness 5xx10^-5m is formed between two glasses plates of surface area 1xx10^-2 m^2 . If the surface tension of the liquid is 60xx10^-2N//m the force that is required to separate the glass plates is.