Question

A disk with diameter = 40 cm and thickness = 5 cm is cast of pure aluminum in an open mold casting operation. Aluminum melts at 660°C, but the pouring temperature will be 800°C. The heat of fusion of aluminum = 398 J/g. Other properties can be found in Tables 4.1 and 4.2. Assume the specific heat has the same value for solid and molten aluminum.

Compute

(a) the unit energy for melting and pouring and
(b) the total energy to heat the metal to the pouring temperature starting from a room temperature of 25°C.

Answer 1

(a)

The unit energy for melting and pouring = 176 J/g

(b)

The total energy to heat the metal to the pouring temperature starting from a room temperature of 25°C = 19217498.31 J

Step-by-step explanation:

The complete answer of the question involves complicated mathematical equations. It is very difficult to write it there so I solved it by hand on paper and attached the handwritten files. You can find your answer in deatailed way in this attached files.