A small hole in the wing of a space shuttle requires a 16.4 cm² patch. (a) What is the patch's area in square kilometers (km²)? Enter your answer in scientific notation.
X 10
km2
(b) If the patching material costs NASA $2.89/in?, what is the cost of the patch to the nearest cent?

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.