An aluminum sphere of radius 0.5 mm falls through a viscous liquid of density 2700 kg/m3. It attains a constant terminal velocity of 1.5 cm/s. What is the viscosity of the fluid? a) 0.001 N.s/m2 b) 0.052 N.s/m2               c) 0.25 N.s/m2

16- A helicopter with a mass of 72kg is towed by a rope 15m perpendicularly from the ocean surface. The pilot's acceleration is g/10. What is the work (J) done on the pilot by the force exerted by the helicopter? (g=9.80m/s2)

1) A laminar fluid flows through a round pipe. What is the shape of fully developed velocity profile? a) flat b) parabolic c) random d) cannot be determined 2) For fully developed laminar pipe flow, the average velocity is measured to be 20 m/s. What is the maximum velocity of the fluid? a) 60 m/s b) 40 m/s c) 10 m/s d) 20 m/s 3) The pressure drop equals to the pressure loss. True or False

An open cylindrical tank with radius of 0.30 m and a height of 1.2 m is filled with water. Determine the spilled volume of the water if it was rotated by 90 rpm. Choices: a) 0.095 cu.m. b) 0.085 cu.m. c) 0.047 cu.m. d) 0.058 cu.m.