21. Which volcanic gas was not added to the earth's atmosphere during early differentiation of the planet?
a. CO2
b. O,
c. H2O (vapor)
d. N
e. H2
most reliant per a
la recent completing straten

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.

intensive properties because they do not depend on the amount of matter in the sample.