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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > Two identical spheres A and B are suspended in an air chamber which is maintained at a temperature of 50C. Find the ratio of the heat lost per second from the surface of the spheres if a. A and B are at temperatures 60C and 55C, respectively. b. A and B are at temperatures 250C and 200C, respectively.

Two identical spheres A and B are suspended in an air chamber which is maintained at a temperature of 50C. Find the ratio of the heat lost per second from the surface of the spheres if a. A and B are at temperatures 60C and 55C, respectively. b. A and B are at temperatures 250C and 200C, respectively.

A body cools down from 60% = C to 55C in 30 s. Using newton's law of cooling calculate the time takken by same body to cool down from 55C to 50C. Assume that the temperature of surrounding is 45C.