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A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m3 and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m2.K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is | |
A. | 555 [Wrong Answer] |
B. | 55.5 [Wrong Answer] |
C. | 0.55 [Wrong Answer] |
D. | 0.15 [Correct Answer] |