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10-1.Thermometry, Thermal Expansion and Calorimetry
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A $2100 W$ continuous flow geyser (instant geyser) has water inlet temperature $= 10^o C$ while the water flows out at the rate of $20\,\, g/sec$. The outlet temperature of water must be about ....... $^oC$
A
$20$
B
$30$
C
$35$
D
$40$
Solution
$P=m c \Delta T,$ where $m=\frac{M}{t}=20 g / s$
Also power is $P=\frac{Q}{t}$
so, $2100=20 \times 10^{-3} \times 4200(T-10)$
$T=35^{\circ} \mathrm{C}$
Standard 11
Physics
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