a. QUESTION 1 - 7 MARKS Answer the following short questions in the space provided: The Bernoulli equation is also referred to as the mechanical energy balance. Show how the terms in the Bernoulli equation with units of represent units of energy. (1 mark) m/s2 b. Table 8.1 lists the roughness of common pipe materials. Do you expect these values to increase OR decrease with pipe age? (1 mark) c. List the two specific conditions that are required to use the Blasius empirical expression to calculate the friction factor. (1 mark) d. Your boss asks you to select a valve that has the lowest possible pressure drop for a particular piping system. Given the option of an angle valve, globe valve, ball valve, or gate valve - which one would you choose? (1 mark) e. For flow over a smooth, flat plate, at what Reynolds number is there a transition from laminar to turbulent flow in the boundary layer? (1 mark) f. What are the two forms of drag that contribute to the total drag on a body in a flow field? (1 mark) a g. Two identical spheres are dropped into a container filled with a viscous fluid. One sphere is close to the wall of the container, the other is far away from the wall. Which one falls faster? (1 mark)