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Q.

A sphere, a cube and a thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of 10000C. Which one of these will cool first?

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a

Plate

b

Sphere

c

Cube

d

None of these

answer is A.

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Detailed Solution

Rate of cooling ∆θt = A∈σ(T4-T04)mc ⇒ ∆θt directly proportional to ASince area of plate is largest so it will cool fastest.

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A sphere, a cube and a thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of 10000C. Which one of these will cool first?