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 `4.0 xx 10^4 J//g` ?

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

A child running a temperature of 101^@F is given an antipyrin (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 specifric heat of human body is approximately the same as that of water, and latent heat of evaporation of water at that temperature is aout 580 cal g^-1 .

A coper block of mass 2.5 kg is heated in a furnace to a temperature of 500 ^@C and then placed on a large ice block. What is the maximum amount of ice that can melt? (specific heat of copper = 0.39 J g^-1 C^-1 , heat of fusion of watter = 335 J g^-1 ).

Calcualte the temperature at which the resistance of a conductor becomes 20% more than its resistance at 27^@C . The value of the temperature coefficient of resistance of the conductor is 2.0 xx 10^-4 K^-1

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