Answer Happy

Question 3 [11 marks] A 3.2 m diameter spherical balloon travels through air at a velocity of 82.8 km/h. What is the drag force on the balloon? Use kinematic viscosity v = 1.52(10)-4 m²/s. Make use of Appendix A.
Appendix A 10 S 102 8 6 6 4 4 Sphere 2 2 10 10 8 X 6 6 1 + Drag coefficient, Cylinder 2 2 1 8 6 4 2 2 101 10-1 468 4 68! 2 2 + 68 2 10 2 4 6 8 68 2 2 10 Reynolds number, Figure 2: Drag Coefficient vs Reynolds Number for Lower Values of NR 10 8 10 8 6 6 4 4 Square cylinder 2 Cylinder Drag coefficient, CD 1 8 1 8 6 6 4 4 Sphere 2 2 10-1 4 68 4 68 2 2 10-1 2 + 68 2 4 68 105 104 106 102 102 Reynolds number, Ne Figure 3: Drag Coefficient vs Reynolds Number for Higher Values of NR