g A helium-filled toy balloon has a gauge pressure of 0.200 atm and a volume of 8.0 liters. How much greater is the internal energy (in J) of the helium in the balloon than it would be at zero gauge pressure

they are both synthetic elements

explanation:

d

um i think it might be a car?

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.