Sir, I can’t understand how do we know about their mass, as only equal areas of both the materials is same is given.
In this case, the rate of cooling for hollow copper sphere and copper cube will be same. The graph given below represents it
sir , how their mass can be same
To anonymous, Area are same of both the structures, that’s why mass is similar.
as thin wall is given, so negligible mass present both of them. So u Can assume they are equal
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