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Two metallic spheres S1 and S2 are made of the same material and have identical surface finish. The mass of S1 is three times that to S2. Both the spheres are heated to the same high temperature and placed in the same room having lower temperature but area thermally insulated from each other. The ratio of the initial rate of cooling of S1 to that S2 is a. 1/3 b. (1/3)1/3 c. (3)-1/2 d. 31/2 I have posted this question before, Is there some one who can answer??
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