First slide

Conduction

Question

The opposite faces of a cubical block of iron of cross section 4 square cm are kept in contact with steam and melting ice. Calculate the quantity of ice melted at the end of 10 minutes, k for iron = 0.2 cgs units.

Moderate

A

300 g
B

150 g
C

75 g
D

450 g

Solution

Each side of the cube is 2 cm.
Further, with usual notation,
$\begin{array}{l} (T_{1} - T_{2}) = (100 - 0) \\ Q = \frac{k A (T_{1} - T_{2}) t}{x} = 24000 c a l \\ m = \frac{Q}{L} = \frac{24000}{80} = 300 g \end{array}$

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