A 5 cm diameter copper sphere (p=8933 kg/m; k=401 W/m K; c,-385 J/kg*K) is initially at...

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A 5 cm diameter copper sphere (p=8933 kg/m; k=401 W/m K; c,-385 J/kg*K) is initially at a uniform temperature of 250 C when it is suddenly immersed in a fluid at 30 C. The convection heat transfer coefficient between the sphere and the fluid is 28 W/mK. Estimate the time necessary for the temperature at the center of the sphere to reach 90 C. a. 37 hours b. 2.2 hours 22 minutes d. 10 minutes A 5 cm diameter copper sphere (p=8933 kg/m; k=401 W/m K; c,-385 J/kg*K) is initially at a uniform temperature of 250 C when it is suddenly immersed in a fluid at 30 C. The convection heat transfer coefficient between the sphere and the fluid is 28 W/mK. Estimate the time necessary for the temperature at the center of the sphere to reach 90 C. a. 37 hours b. 2.2 hours 22 minutes d. 10 minutes