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A "flow calorimeter" is used to measure ...

A "flow calorimeter" is used to measure the specific heat of a liquid. Heat is added at a known rate to a stream of the liquid as it passes through the calorimeter at known rate, then a measurement of the resulting temperature difference between the in flow and the out flow points of the liquid stream enables us to compute the specific heat of the liquid. A liquid of density 0.85 `g//cm^(3)` flows through a calorimeter at the rate of 8.0 `cm^(3)//s`. heat is added by means of a 250 watt electric heating coil, and a temperature difference of `15^(@)C` is established in steady state conditions between the in flow and out flow points.
Q. Rate of heat added per second is

A

4.18 J/s

B

59.8 cal/s

C

5 cal/s

D

90 cal/2

Text Solution

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The correct Answer is:
B
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A liquid of denisty 850kgm^(-3) flows through a calorimeter at the rate of 8xx10^(-6) cubic metre per second. Heat is supplied by mean of a 250- watts electric heating coil and a temperature difference of 15^(@)C is established in steady state conditioins betweenthe inflow adn outflow. Find the specific heat capacity of the liquid.

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Knowledge Check

  • A "flow calorimeter" is used to measure the specific heat of a liquid. Heat is added at a known rate to a stream of the liquid as it passes through the calorimeter at known rate, then a measurement of the resulting temperature difference between the in flow and the out flow points of the liquid stream enables us to compute the specific heat of the liquid. A liquid of density 0.85 g//cm^(3) flows through a calorimeter at the rate of 8.0 cm^(3)//s . heat is added by means of a 250 watt electric heating coil, and a temperature difference of 15^(@)C is established in steady state conditions between the in flow and out flow points. Q. Rate of heat absorption per unit specific heat capacity is

    A
    100g-`.^(@)C//s`
    B
    102g-`.^(@)C//s`
    C
    50g-`.^(@)C//s`
    D
    `10.2g-.^(@)C//s`

  • A "flow calorimeter" is used to measure the specific heat of a liquid. Heat is added at a known rate to a stream of the liquid as it passes through the calorimeter at known rate, then a measurement of the resulting temperature difference between the in flow and the out flow points of the liquid stream enables us to compute the specific heat of the liquid. A liquid of density 0.85 g//cm^(3) flows through a calorimeter at the rate of 8.0 cm^(3)//s . heat is added by means of a 250 watt electric heating coil, and a temperature difference of 15^(@)C is established in steady state conditions between the in flow and out flow points. Q. Specific heat of the liquid is

    A
    `0.59cal//g.^(@)C`
    B
    `4cal//g.^(@)C`
    C
    `2cal//g.^(@)C`
    D
    `9cal//g.^(@)C`

  • A liquid of density 0.85 g//cm^(3) flows through a calorimeter at the rate of 8.0 cm^(2)//s . Heat is added by means of a 250 W electric heating coil and a temperature difference of 15^@C is established in steady state conditions between the inflow and the outflow points of the liquid. The specific heat for the liquid will be

    A
    `0.6kcal//kgK`
    B
    `0.3kcal//kgK`
    C
    `0.5kcal//kgK`
    D
    `0.4 kcal//kgK`

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