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 ΔT . Because of atmospheric friction, it absorbs energy at a constant rate of R. The time before the solid becomes completely molten is

Options:

A) M(C+L)ΔTR

B) M(CΔT+L)R

C) M(C+L)ΔTR

D) R(MΔT(C+L)

Show Answer

Answer:

Correct Answer: B

Solution:

: Rt1=MCΔT and Rt2=Ml



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