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Find the value of Joule's mechanical equ...

Find the value of Joule's mechanical equivalent of heat from the following data: density of hydrogen at NTP is `0.09kgm^(-3)`, its specific heat capacity at constant pressure `=3400 cal kg^(-1)K^(-1)` and ratio of specific heat capacities `(gamma)=1.4`.

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The correct Answer is:
`J=4.244Jcal^(-1)`
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