The $SI$ unit of mechanical equivalent of heat is
Joule $\times$ Calorie
Joule$/$Calorie
Calorie $\times$ Erg
Erg$/$Calorie
(b) $J = \frac{W}{Q} = \frac{{Joule}}{{cal}}$
In engines water is used as coolant, because ……
$4200\, J$ of work is required for
On what does the heat required to increase the temperature of substance depend ?
Water falls from height $500\,m$. The rise in temperature of water at bottom if whole of energy remains in water, will be …….. $^oC$ [sp. heat of water $4.2\,KJ/kg$ ]
During illness an $80\, kg$ man ran a fever of $102.2^o F$ instead of normal body temperature of $98.6^o F$. Assuming that human body is mostly water, how much heat is required to raise his temperature by that amount ………. $kcal$
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