2 1 point A balloon is partially inflated with 6.56 liters of helium gas at sea level, where the atmospheric pressure is 1.00 atm. The balloon ascends to an altitude of 1600 meters, where the pressure is 0.59 atm. What is the volume of the helium balloon at the higher altitude? ​

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

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.