Question: 4 . 5 A metal sphere 2 0 mm radius at 9 0 0 K is allowed to cool in a room at 3 1

4.5 A metal sphere 20 mm radius at 900 K is allowed to cool in a room at 310 K by
(i) convection only (ii) radiation only.
Determine in each case the time required for the sphere to reach 450 K Density =2700kgm3, specific heat =1110JkgK, conductivity =218WmK. Convection coefficient =18 W/m2K.
4 . 5 A metal sphere 2 0 mm radius at 9 0 0 K is

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