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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 2000C. Which of these objects will cool slowest when left in air at room temperature?

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a

the sphere

b

the cube

c

the circular plate

d

all will cool at same rate

answer is A.

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Detailed Solution

Rate of cooling ∝ surface area and for a given mass, surface area of sphere is minimum.
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