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Does the change in volume of a body when...

Does the change in volume of a body when its temperature is raised depend on whether the body has cavities inside, other things being equal?

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No, the change in the volume of a body is always the same whether there is any cavity or not. Suppose we cut off a portion and then place it back in the cavity. On heating the body, the two parts will expand and no gap is created, so the fact that a portion has been cut off does not affect expansion--the whole body expands, as if it had not been out. The distance between A and B remains the same, irrespective of whether matter is (i) continuous from A to B or (ii) discontinuous.
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Knowledge Check

  • Heat given to a body which raises its temperature by 1^@C is

    A
    water equivalent
    B
    thermal capacity
    C
    specific heat
    D
    temperature gradient

  • When a body has the same temperature as that of its surroundings

    A
    it does not radiate heat
    B
    it radiates same quantity of heat as it receives from the surroundings
    C
    it radiates same quantity of heat as it receives from the surroundings
    D
    it radiates same quantity of heat as it receives from the surroundings

  • Heat is absorbed by a body. But its temperature does not raised. Which of the following statement explains the phenomena?

    A
    only K.E. of vibration increases
    B
    Only P.E. of inter molecular force change
    C
    No increases in internal energy takes place
    D
    Increase in K.E. is blanced by decrease in P.E.

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    A body at a temperature of 50^0F is placed outdoors where the temperature is 100^0F . If the rate of change of the temperature of a body is proportional to the temperature difference between the body and its surrounding medium. If after 5 min the temperature of the body is 60^0F , find (a) how long it will take the body to reach a temperature of 75 ^0 F and (b) the temperature of the body after 20 min.

    Does the work done in raising a body through a certain height depend upon how fast it is raised ?

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