A 4 cm diameter copper sphere is initially at a uniform temperature of 200C It is suddenly exposed to a convection environment at 30C with h 20 W m2C Calculate the time necessary for the center of the sphere to reach a temperature of 80C ...

A 4-cm-diameter copper sphere is initially at a uniform temperature of 200C. It is suddenly exposed to

Question:

A 4-cm-diameter copper sphere is initially at a uniform temperature of 200ºC. It is suddenly exposed to a convection environment at 30ºC with h = 20 W/m2·ºC. Calculate the time necessary for the center of the sphere to reach a temperature of 80ºC.