5.) When an aluminum cookie sheet is placed in an oven and heated up, it expands due to the temperature change. The change in area of the cookie sheet is modeled using the following equation: AA = A,yAT

Figure P2.33 shows a portion of the H,O-NaCl phase diagram. 10 Liquid (brine) Salt Ice + -10 F liquid (brine) liquid (brine) -20 Ice + salt -30 NaCI 10 20 30 H2O 100 90 80 70 FIGURE P2.33 Composition, weight % a. Using the diagram, briefly explain how spreading salt on ice causes the ice to melt. Show numerical examples in your discussion. b. At a salt composition of 10%, what is the temperature at which ice will start melting? c. What is the eutectic temperature of the ice and salt combination? Temperature, °C

9.45 A sphere of diameter D and density p, falls at a steady rate through a liquid of density p and viscosity . If the Reynolds number, Re=pDU/μ, is less than 1, show that the viscosity can be determined from u gD²(p. - p)/18 U.