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Q. |
A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions? Assume that the conductive heat transfer co-efficient is infinitely large. |
A. | 5 minutes |
B. | 10 minutes |
C. | 20 minutes |
D. | 40 minutes |
Answer» A. 5 minutes |
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