The following result were obtained by an analyst in the determination of pb in soil from lead smelting contaminated site 18.6, 18.1, 17.8, 18.0, 17.8, 18.4, 18.0, 17.9 , 18.6. Calculate the mean, standard deviation and coefficient of variation for the analyses result

its pwirhfpiwe

explanation:

because dgjpwojefopjwp

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.