Properties Of Solids And Liquids Question 538
Question: A solid object of mass M is made of material of specific heat capacity c, latent heat of fusion L and of very high thermal conductivity. When the object enters the atmosphere from outer space, its temperature below its melting point by $ \Delta T $ . Because of atmospheric friction, it absorbs energy at a constant rate of R. The time before the solid becomes completely molten is
Options:
A) $ \frac{M(C+L)\Delta T}{R} $
B) $ \frac{M(C\Delta T+L)}{R} $
C) $ \frac{M(C+L)\Delta T}{R} $
D) $ \frac{R}{(M\Delta T(C+L)} $
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Answer:
Correct Answer: B
Solution:
: $ Rt _{1}=MC\Delta T $ and $ Rt _{2}=Ml $
BETA
