4.9 Based on the dimensionless conduction heat rates for cases 12–15 in Table 4.1b, find shape factors for the following objects having temperature T,, located at the surface of a

semi-infinite medium having temperature T2. The surface of the semi-infinite medium is adiabatic. (a) A buried hemisphere, flush with the surface. (b) A disk on the surface. Compare your result to Table 4.1a, case 10. (c) A square on the surface. (d) A buried cube, flush with the surface.