h. = 10 h =0 D = 10 Reveal Cross Section D = 20 Reveal Cross Section h = 10 D = 10 Reveal Cross Section The structure is made of variable material for a varying mass with density function p(h) = In(21) (h+1) 240,000 kilograms per cubic meters for a total mass of 240,000 kilograms. This function p should be interpreted as giving the density (i.e. mass per unit volume) of the structure's cross section at a height h. Calculate the total lifting energy required to build this structure from the ground up. You should first use a Riemann sum to estimate the total energy to within J Joules, and then write and evaluate a definite integral that will calculate the desired energy. Be sure to label each piece of the definite integral to show the weight-distance product being constructed, and to specify what each symbol in the integral formula means