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The weight of a balloon is W1 when empty...

The weight of a balloon is `W_1` when empty and `W_2` when filled with air. Both are weighed in air by the same sensitive spring balance and under identical conditions.

A

`W_1 = W_2`, as the weight of air in the balloon is offset by the force of buoyancy on it.

B

`W_2 lt W_1` due to the force of buoyancy acting on the filled balloon.

C

`W_2 gt W_1`, as the air inside is at a greater pressure and hence has greater density than the air outside.

D

`W_2 = W_1 +` weight if the air inside it.

Text Solution

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The correct Answer is:
C
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Knowledge Check

  • The weight of an empty balloon on a spring balance is W_(1) . The weight becomes W_2 when the balloon is filled with air. Let the weight of air itself be W. Neglect the thickness of balloon when it is filled with air. Also neglect the difference the density of air inside and outside the balloon.

    A
    `W_(2) lt W_(1) + W`
    B
    `W_(2) = W_(1) + W`
    C
    `W_(2) gt W_(1)+W`
    D
    `W_(2) lt W_(1)`

  • The weight of an empty balloon on a spring balance is w_(1) . The weight becomes w_(2) when the balloon is filled with air . Let the weight of air itself be w. Neglect the thickness of balloon when it is filled with air. Also neglect the difference between the density of air inside and outside the balloon

    A
    `w_(2)ltw_(1)+w`
    B
    `w_(2)=w_(1)+w`
    C
    `w_(2)gtw_(1)+w`
    D
    `w_(2)ltw_(1)`

  • statement 1 is false, statement 2 is true. Statement-1: A soft plastic bag weights the same when empty or when filled with air and measured in vacuum. Statement-2: The same results will be observed when measured in air.

    A
    Statement-I is true, statement-2 true and statements-2 is a correct explanation for statements 1
    B
    Statement 1 is true, statement 2 is true, statement-2 is not a correct explanation for statement 1
    C
    Statement 1 is true, statement 2 is false
    D
    Statement 1 is false, statement 2 is true

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