#9. If you and a friend share the work equally in emptying the conical container in Problem 8, what depth of grain should the first person leave for the second person to empty?

\f8. The conical container in Fig. 18 is filled with loose grain which weighs 40 Fig. 18 pounds/ft. (a) How much work is done lifting all of the grain over the top of the cone? (b) lifting the top 2 feet of grain over the top of the cone? 9. If you and a friend share the work equally in emptying the conical container in Problem 8, what depth of grain should the first person leave for the second person to empty