We consider a vertical strut with forward speed u 15ms-1 and analyze 2d flow in a horizontal cross-sectional plane. the effect of the free surface is neglected th chord length is 5 m, and the thickness-chord length ratio is 0.10. assum u=1.35×10-6 m2 s-1 and that the flow is turbulent from the leading edge. (a) what is the drag force in nm-1 if the strut surface is smooth? (b) what is the drag force in nm1 if the strut surface has a roughness height of 150 (c) estimate the boundary-layer thickness at the trailing edge by using a formula for a smooth flat plate (d) assume that the strut surface is smooth, and plot the velocity distribution in the wake at a longitudinal distance 50mfrom the center of the strut. (e) consider two smooth struts in a tandem arrangement. the strut dimensions and the speed are as above. the longitudinal distance between the centers of the two struts is 50 m. assume the upstream strut is not influenced by the flow around the downstream strut. however, the downstream strut is influenced by the wake of the upstream strut. estimate the drag force on the downstream strut. hint: use wake solution at the center of the downstream stut to define a modified inflow velocity to the downstream strut)

Question 1 what is amperage? is the rate of doing work. is the rate of flow of protons in electric current. represents the amount of pressure behind electron flow. is the rate of flow of electrons in electric current. 2 points question 2 what is voltage? is the rate of doing power. represents the amount of pressure behind electron flow. is the rate of doing work. is the rate of flow of electrons in electric current. 2 points question 3 what is power? is the rate of flow of protons in electric current. is the rate of flow of electrons in electric current. is the rate of doing work. represents the amount of pressure behind electron flow. 2 points question 4 if we multiply volts times amps we get what? power circuit work current 2 points question 5 what are two ways alternating currents are similiar? in both ac and dc electrons flow in the same pattern. in both ac and dc, the flow of electrons changes directions back and forth. both ac and dc are only possible in certain materials with atoms that will allow electron flow. both ac and dc involve the flow of electrons. 4 points question 6 how does the flow of electrons flow in an alternating current? the flow of electrons is always slower in an alternating current than within a direct current. the flow of electrons is not constant and forward; it changes direction back and forth. electrons flow from from a higher affinity to that of a lower affinity. electron flow is constant and only in a forward direction. 2 points question 7 what is the flow like in a direct current? the flow of electrons is not constant and forward; it changes direction back and forth. the flow of electrons is constant and only in a forward direction. the flow of electrons go from a higher affinity to a lower affinity. the flow of electrons are always faster in a direct current. 2 points question 8 how is an electric current able to flow? electrons flow from the higher affinity to lower affinity and electrical current is generated. protons flow from the higher affinity to lower affinity and electrical current is generated. the movement of protons from one atom to another leads to an electric charge. the movement of electrons from one atom to another atom in a line results in a flow of electric current. 2 points question 9 how do electrons move from the two different types of metal in a battery? protons flow from the metal with the lower affinity to the metal with higher affinity and electrical current is generated. electrons flow from the metal with the lower affinity to the metal with higher affinity and electrical current is generated. electrons flow from the metal with the higher affinity to the metal with lower affinity and electrical current is generated. protons flow from the metal with the higher affinity to the metal with lower affinity and electrical current is generated.