Gujarati
Hindi
10-1.Thermometry, Thermal Expansion and Calorimetry
medium

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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