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A geyser heats water flowing at the rate...

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 × 10^4 J//g` ?

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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 combination is 4.0 xx 10^(4) J cdot g^(-1) ?

What is the thermal capacity of 40 gm of aluminium? Specific heat of aluminium is 0.2 cal g^-1^@C^-1 .

Knowledge Check

  • 100 g of water is heated from 30^@C to 50^@C . Ignorning the slight expansion of the water, the change in its internal energy is : (specific heat of water is 4148 J//kg//K )

    A
    8.4 kJ
    B
    84 kJ
    C
    2.1 kJ
    D
    4.2 kJ

  • The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25^@C , increase in temperature of 18.94 g water in calorimeter is 0.632^@C . If the specific heat of water at 25^@C is 0.998 cal g^-1deg^-1 , the value of the heat of combustion of benzoic acid is

    A
    881.1 cal
    B
    771.4 cal
    C
    981.1 cal
    D
    871.2 cal

  • A vacuum flask contains 0.4 kg liquid paraffin whose temperature can be increased at the rate of 1^(@)C per minute using an immersion heater of power 12.3 W. When a heater of 19.2 W is used to heat 0.5 kg of liquid paraffin, in the same flask, the rate of rise temperature is 1.2^(@)C per minute. What is specific heat of the paraffin?

    A
    `"0.529 cal.g"^(-1).^(@)C^(-1)`
    B
    `"0.429 cal.g"^(-1).^(@)C^(-1)`
    C
    `"0.472 cal.g"^(-1).^(@)C^(-1)`
    D
    `"0.623 cal.g"^(-1).^(@)C^(-1)`

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    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) .

    A Carnot engine is being operated by taking heat from a source at temperature 527^(@)C . If the surrounding temperature is 27^(@)C , what is the efficiency of the engine? If the source supplies heat at the rate of 10^(9)J per minute, how much usable work is obtained per minute?

    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 vacuum flask contain 0.3 kg of liquid paraffin whose temperature can be increased at the rate of 1^(@)C per minute using an immersion heater of power 12.3W. When a 19.2 W heater is used to heat 0.4 kg of liquid paraffin, in same flask, the rate of rise of temperature is 1.2^(@)C per minute. Find the specific heat of paraffin and the thermal capacity of the flask.

    The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25^@C increase the temperature of 18.94 kg of water by 0.632^@C . If the specific heat of water at 25^@C is 0.998 cal/g-deg, the value of the heat of combustion of benzoic acid is

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