A geyser heats water flowing at the rate of 3.0 litres per minute from `27^@` C to `77^@`C. If the geyser operates on a gas burner, what is the rate of consumption of the fuel if its heat of combustion is `4.0xx10^4` J/g ?

What will be the difference in volume of water when it is heated from 0^(@)C to 10^(@)C ?

100g of water is heated from 30^@C to 50^@C . Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184J//kg//K ):

A stone of 0.36 m^(2) cross -sectional area and 0.1 m thickness has its lower surface in contact with water at 100^(@)C and upper surface in contact with ice at 0^(@)C . If 4.8 kg ice melting in 1 hour, then what is the thermal conductivity of stone ? Latent heat of fusion of ice is 3.36xx10^(5)" J/kg" .

A refrigerator takes heat from water at 0^(@)C and transfer it to room at 27^(@)C . If 100 kg of water is converted in ice at 0^(@)C then calculate the work done. (Latent heat of ice 3.4xx10^(5) J//kg )

200 g of water is heated from 40^(@)C "to" 60^(@)C . Ignoring the slight expansion of water , the change in its internal energy is closed to (Given specific heat of water = 4184 J//kg//K ):

A child running a temperature of 101 ^(@) F is given an antipyrin (1.e. a medicine that lowers fever) which causes an increase in the rate of evaporation of sweat from his body. If the fever is brought down to 98^(@) F in 20 minutes, what is the average rate of extra evaporation caused by the drug. Assume the evaporation mechanism to be the only way by which heat is lost. The mass of the child is 30 kg The specific heat of human body is approximately the same as that of water, and latent heat of evaporation of water at that temperature is about 580 " cal g"^(-1) .

At room temperature (27.0^(@)C) the resistance of a heating element is 100 Omega. What is the temperature of the element if the resistance is found to be 117 Omega. given that the temperature coefficient of the material of the resistor is 1.70 xx 10 ^(-4)"" ^(@)C^(-1).

A child running a temperature if 101^(@)F is given an antipyrine (i.e. a medicine that lowers fever) which causes an increase in the rate of evaporation of sweat from his body. If the fever is brought down to 98^(@)F in 20 min, what is the average rate of extra evaporation caused, by the drug. Assume the evaporation mechanism to be the only way by which heat is lost The mass of the child is 30 kg. The specific heat of human body water, and latent heat of evaporation of water at that temperature is about "580 cal g"^(-1) .

A brass boiler has a base area of 0.15 m^(2) and thickness 1.0 cm. It boils water at the rate of 6.0 kg/min when placed on a gas stove. Estimate the temperature of the part of the flame in contact with the boller. Thermal conductivity of brass = 109 J s^(-1) m^(-1) K^(-1) , Heat of vaporisation of water = 2256 xx 10^(3) J kg^(-1) .

A steam engine delivers 5.4 xx 10^8 J of work per minute and services 3.6 xx 10^9 J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute ?