The mechanical equivalent of heat $J$ is
A constant
A physical quantity
A conversion factor
None of the above
(c) $‘J’$ is a conversion
A body of mass $5 \,kg$ falls from a height of $30$ metre. If its all mechanical energy is changed into heat, then heat produced will be…….. $cal$
If specific heat of a substance is infinite, it means
The height of a waterfall is $84$ metre. Assuming that the entire kinetic energy of falling water is converted into heat, the rise in temperature of the water will be $(g = 9.8\,m/{s^2},\;J = 4.2\,joule/cal)$
$0.93$ $watt-hour$ of energy is supplied to a block of ice weighing $10\,gm.$ It is found that
The thermal capacity of $40\, gm$ of aluminium (specific heat $= 0.2\, cal/gm/°C)$ is …….. $cal/^oC$
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