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10-1.Thermometry, Thermal Expansion and Calorimetry
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Of two masses of $5 \,kg$ each falling from height of $10\, m,$ by which $2\,kg$ water is stirred. The rise in temperature of water will be........ $^oC$
A
$2.6$
B
$1.2$
C
$0.32$
D
$0.12$
Solution
(d) $W = JQ$ $\Rightarrow$ $(2m)gh = J \times m'c\Delta \theta $
$\Rightarrow$ $2 \times 5 \times 10 \times 10 = 4.2(2 \times 1000 \times \Delta \theta )$
$\Rightarrow$ $\Delta \theta = 0.1190^\circ C = 0.12^\circ C$
Standard 11
Physics
