Spheres of 40-mm diameter heated to a uniform temperature of 400c are suddenly removed from the oven and placed in a forced-air bath operating at 25c with a convection coefficient of 300 w/m2 .K on the sphere surfaces. The thermophysical properties of the sphere material are =3000 kg/m3 , c =850 j/kg.K, and k=15 w/m.K. How long must the spheres remain in the air bath for 80% of the thermal energy to be removed?
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