The top of an insulated cylindrical container is covered by a disc having emissivity 0.6 and conductivity 0.167 `"WK"^(– 1)m^(–1)` and thickness 1 cm. The temperature is maintained by circulating oil as shown in figure. Find the radiation loss to the surrounding in `"Jm"^(–2)s^(–1 )`if temperature of the upper surface of the disc is `27^(@)"C"` and temperature of the surrounding is `27^(@)"C"`.

Find the time for which layer of ice 5 cm thick on the surface of a pond will increase its thickness by 0.1 cm when temperature of the surrounding air is -20^(@) C .

A heated iron block at 127 ∘C loses "300J of heat to the surrounding which is at a temperature of 27∘C.Delta S for this process is 0.05xJK^(-1) Find the value of x.

2 litres water at 27^(@)C is heated by a 1kW heater in an open container. On an average heat is lost to surroundings at the rate 160 J//s . The time required for the temperature to reach 77^(@)C is

2 litres water at 27^(@)C is heated by a 1kW heater in an open container. On an average heat is lost to surroundings at the rate 160 J//s . The time required for the temperature to reach 77^(@)C is

An insulated container has a wooden lid at the top whose conductivity is 0.15 J//m""^@Cs , thickness is 5 mm and emissivity is 0.5. The temperature of the top of the wooden lid is maintained at 125^@C and the ambient temperature is 27^@C . Hot liquid is now circulated through the container as shown in the figure. Determine the rate of loss of heat per unit area due to radiation from the wooden lid and temperature of the oil. Take sigma = 5.66 xx 10^(-8) Wm^(-2) K^(-4)

A monatomic ideal gas is contained in a rigid container of volume V with walls of total inner surface area A, thickness x and thermal conductivity K. The gas is at an initial temperature t_(0) and pressure P_(0) . Find the pressure of the gas as a function of time if the temperature of the surrounding air is T_(s) . All temperature are in absolute scale.

A monatomic ideal gas is contained in a rigid container of volume V with walls of total inner surface area A, thickness x and thermal conductivity K. The gas is at an initial temperature t_(0) and pressure P_(0) . Find the pressure of the gas as a function of time if the temperature of the surrounding air is T_(s) . All temperature are in absolute scale.

A heated irron block at 127^(@)C loses 300J of heat to the surroundings which are at a temperature of 27^(@)C . This process is 0.05x J K^(-1) . Find the value of x .

A heated irron block at 127^(@)C loses 300J of heat to the surroundings which are at a temperature of 27^(@)C . This process is 0.05 J K^(-1) . Find the value of x .

At what rate a layer of ice will be formed if the surrounding temperature is at -10^(@)C ? Thermal conductivity of ice =1.6Wm^(-1)K^(-1) . Initial thickness of ice is 1mm