He ventilating fan of the bathroom of a building has a volume flow rate of 28 L/s and runs continuously. If the density of air inside is 1.20 kg/m3, determine the mass of air vented out in one day. The mass of air is kg.

Around steel bar, 20 mm in diameter and 400 mm long, is placed concentrically within a brass long. tube which has an outside diameter of 30 mm and thickness 4 mm. the tube is 400 mm the upper end of the vertically placed compound bar is rigidly fixed and a collar is fitted to the bottom end. the application of a load p results in the compound rod storing a total of 5 j of energy.calculate (a) the gradually applied load; (b) the suddenly applied load; (c) the impact load that falls 100 mm and induces 5 j of energy; (d) the instantaneous stresses in both materials; and (e) the instantaneous elongation of the compound rod (egt = 200 gpa and egr = 100 gpa).