The conical container in Fig- 18 is lled with loose grain which weighs 441] poundsi'ft3 _ (a) How.r much work is done lifting all of the grain over the top of the cone? (h) lifting the top 2 feet of grain over the top of the cone? If you and a friend share the work equallyT in emptying the conical oontainer in Problem 3, what depth of grain should the rst person leave for the second person to empty