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A hollow copper sphere S and a hollow copper cube C, both of negligible thin wall of same area, are filled with water at 90 C and allowed to cool in the same environment. The graph that correctly represents their cooling is Sir, I can’t understand how do we know about their mass, as only equal areas of both the materials is same is given.

A hollow copper sphere S and a hollow copper cube C, both of negligible thin wall of same area, are filled with water at 90 C and allowed to cool in the same environment. The graph that correctly represents their cooling is

 
Sir, I can’t understand how do we know about their mass, as only equal areas of both the materials is same is given.

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Grade:12th pass

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