For this assignment, you will develop and use a model of the Earth-Moon-Sun system to describe the
cyclic patterns of lunar phases and eclipses of the Sun and moon. You also will model and illustrate how
the tilted Earth rotates on its axis, causing day and night. You will then create a multimedia presentation
featuring your models.

the answer is 0.8m.

by: nicholas

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.