Thermal Propert...

The area of the glass of a window of a room is 10 m² and thickness 2 mm. The outer and inner temperature arc 40°C and 20°C respectively. Thermal conductivity of glass in M.K.S. system is 0.2. The heat flowing in the room per second will be

The spectrum from a black body radiation is a

The top of insulated cylindrical container is covered by a disc having emissivity 0.6 and thickness 1 cm. The temperature is maintained by circulating oil as shown in figure. If temperature of upper surface of disc is 127°C and temperature of surrounding is 27°C, then the radiation loss to the surrounding will be

The following figure shows two air-filled bulbs connected by a U-tube partly filled with alcohol. What happens to the levels of alcohol in the limbs X and Y when an electric bulb is placed midway between the bulbs is Lighted

Out of the following, in which vessel will the temperature of the solution be higher after the salt is completely dissolved?

A steel ball of mass 0.1 kg falls freely from a height of 10 m and bounces to a height of 5.4 m from the ground. If the dissipated energy in this process is absorbed by the hail, the rise in its temperature is (Specific heat of steel = 460 J kg^-1C^-2g = 10 ms^-2)

Water falls from a height of 500 m. What is the rise in temperature of water at bottom if whole energy remains in the water?

A steel metre scale is to be ruled so that millimetre intervals are accurate within about 5 x i0 mm at a certain temperature. The maximum temperature variation allowable during the ruling is (Coefficient of linear expansion of steel = 10 × 10^-6 K^-1)

During illness, a 80 kg man ran a fever of 102.2F instead of normal body temperature of 98.6°F. Assuming that human body is mostly water, how much heat is required to raise his temperature by that amount