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.

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.

The thermal conductivity of a material in CGS system is 0.8. In steady state, the rate of flow of heat 20 cal/s-cm^2', then the thermal gradient will

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

An ice box used for keeping cold eatables has a total wall area of 1 metre^2 and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is K=0.01 (jou l e)/(metre)^@C . It is filled with ice at 0^@C along with eatables on a day when the temperature is 30^@C . The latent heat of fusion of ice is 334 x 10^3 joules/kg. The amount of ice melted in one day is (1 day = 86,400 seconds)

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.

Read the following paragraph and answer the questions given below it: The resistance of a metal falls when cooled below room temperature. Many scientists believed that the value of the resistance would become constant at some very low temperature, allowing the current to flow with little or no resistance. H. K. Onnes successfully liquefied helium in 1908 by cooling it to about 4 K. In 1911, while investigating the electrical property of very pure mercury. Onnes discovered that at a temperature of 4.2 kelvin, its resistance practically vanished. This new state, on account of its extraordinary property, is now called the superconducting state and the phenomenon is called superconductivity. A superconductor, below a certain critical temperature, offers almost zero resistance to a flow of current through it. Onnes also discovered that a superconductor exhibits persistent current: once set up, the current continues to flow for a very long time without an electric potential difference driving it and without significant loss. Superconductivity is used in many diverse areas, such as magnetically levitated trains, transmission of electricity, increasing speed of computers, in MRI (magnetic resonance imaging). Name any two applications of super-conductivity.

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

A refrigerator door is 150 cm high, 80 cm wide and 6 cm thick. If the coefficient of conductiviy is 0.0005 (cal)/(cm s^@C) and the inner and outer surfaces are at O^@C and 30^@C respectively, then what is the heat loss (in calories) per minute through the door?

The coefficient of absorption and coefficient of reflection of a thin uniform plate are 0.75 and 0.20, respectively. If 200 K cal of heat is incident on the surface of the plate, find the quantity of heat transmitted.