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A solid object of mass M is made from a material of specific heat capacity C and specific latent heat of fusion L and of very high thermal conductivity enters the atmosphere from
outer space, its temperature being below its melting point by !:!T. Because of atmospheric friction it absorbs energy at a constant rate R. The time before the solid becomes
completely molten is given by:

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$\frac{M (C + L) ∆ T}{R}$

$\frac{M (C ∆ T + L)}{R}$

$M (C + L) ∆ TR$

$\frac{R}{M ∆ T (C + L)}$

answer is B.

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Detailed Solution

Q = R t= M C $∆ T + M L$

t = $\frac{M (C ∆ T + L)}{R}$

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