A black body at 27°C surrounds another at -73°C.Calculate the net heat transferred per square metre of the body at higher temperature.

A body at higher temperature contains more heat. Comment

ABCD is a square of side 20 cm positive charges of +2 * 10^-9 C. +4 * 10^-9 C and + 8 * 10^-9 C are placed at the corners A, B and C respectively. Calculate the work required to be done to transfer a unit positive charge from D to the point of intersection of the diagonals.

A body cools from 60°C to 50°C in 10 min.if room temperature is 25°C ,the temperature of the body at the end of next 10 min will be

In an experiment on the specific heat of a metal, a 0.20 kg block of the metal at 150^@C is dropped in a copper calorimeter (of water equivalent 0.025 kg) containing 1-50 cm^3 of water at 27^@C . The final temperature is 40^@C . Compute the specific heat of the metal. If heat losses to the surroundings are not negligible, is your answer greater or smaller than the actual value for specific heat of the metal?

75 g of water at 100^@ C is added to 20 g of ice at -15^@C . Calculate the resulting temperature, give that latent heat of ice= 80 cal g^(-1)C^(-1) and specific heat of ice=0.5 cal g^(-1) C^(-1) .

When 0.15 kg of ice at 0^@C mixed with 0.30 kg of water at 50^@C in a container, the resutling temperature is 6.7^@C . Calculate the latent heat of fusion of ice. Given S_(water) = 4186J kg^-1 K^-1 .

Calculate the amount of radiation of a black body at 400K temperature. (sigma= 5.67 xx 10^-8 watt//m^2 //k^4)

The temperatures of two bodies measured by a thermometer are t_1 = 40^@C +_ 1 C and t_2 = 80^@C +_ 1^@C . Calculate the temperature difference and the error there in.

A body cools from 50°C to 40°C in 5 min .Its temperature comes down to 33.3°C in next 5 min .the temperature of surrounding is