For copper-zinc corrosion couple, when the current density at the copper cathode is 0.05 A/cm2, the copper cathode area is 100 cm2, and the zinc anode area is 1 cm2 , we calculated the weight loss of zinc to be 6.1 gram per hour. The rate of thinning of Zinc anode is; Group of answer choices

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.

the crab is multicellular

the pond organism is unicellular