Question

Problem 2: 35 points A cylinder of 5 m height is fitted with a massless piston of negligible thickness and diameter D-Im. Initially, the piston is at the top of the cylinder and 5 kg of boiling water at 100rC existed below the piston. 3000 kg of liquid water at 20C were poured slowly and at a constant rate over the piston to compress the boiling water. Neglect kinetic and potential energy changes a) Find the work done on the boiling water. b) Find the amount of heat transferred during the process Was the boiling water cooled or heated? c) Piston Po Po p A 20 c Liquid Water to0 Boiling Water Piston Boiling Water The Debate Glub a pe here to search. m s

Answer 1

20 c rooc 5m 5 K3 (-X 5kg final at 20'c wates 3000 ка initial Volume af Now Зо оо - specific valume - oool = V, -V= 3. 92t-3 m 2 1 ч *ой- л V= 0.927 m3 1 0.1854 m/ка specific volume 0.J27 3.327 m2 femp. aenmajns comst shawrn in as Speci c volume 3.927 So, isothenmal o.75 m3 is Con di tion work done o t So, intial Vapouy mearly Vi ln 0.927 = 5x 462 x 373 X 1243.9I KJ Value of W.D. So, W. D the System u = -1243.91 KT Heat is Jost foom e ystem 1243.31 KJ boiling , So, is cooled water