The door is 1980 mm high, 760 mm wide, 5 cm thick, and the density of steel is 7.85 gcm3. what is the mass of the door? 3 . 99 o 76 ao-0s * 7.35 o 9/ h 11. given that the heat capacity of steel is 502 jkg'k-1, determine the amount of energy required to reach the melting point of steel at 3700 c i. 09 12. given that the latent heat of fusion of steel is 251 kjkg1, determine the energy required to change the steel from the solid state to the liquid state at 3700 c 0-14 x10