Correct! Question 1 9/9 pts A uniform block of steel (SG = 7.85) will "float" at a mercury-water interface. What fraction of the steel block is submerged in the mercury? 0.5 0.17 0.25 0.83 Correct! Question 2 9/9 pts Water, assumed incompressible, flows steadily through a very wide rectangular duct of depth w. The entrance velocity is constant, u= U 0, and the exit velocity approximates turbulent flow, u = u max (1-y/ h)^1/7. h = half height of duct, y = distance up from the centerline. This expression is only good for the top half of the duct, so the total flow is 2 X the integral of u dA. Integrate from 0 to h Determine the ratio Uo/u max for this flow. 7/8 8/7 1/2 Question 3 9/9 pts Water flows through a nozzle. the inlet diameter is 20 cm and the velocity is 1.59 m/s. The exit diameter is 6 cm. what is the exit velocity m/s? 8.8 35 12 Correct! 17.7 Correct! Question 4 9/9 pts Water flows through a nozzle. the inlet diameter is 20 cm and the velocity is 1.59 m/s. What is the mass flow rate kg/s? 0.05 kg/s 200 kg/s 50 kg/s 12.5 kg/s Question 5 9/9 pts Water flows into a Y-section. The flow is 0.5 cubic meters/sec. One section of the Y has a velocity of 12 m/s and a diameter of 18 cm. The other Y section has a diameter of 13 cm. What is the volume flow rate through the 13 cm tube? Correct! 0.2 m3/s 0.5 m3/s 2 m3/s 0.3 m3/s Correct! Question 6 9/9 pts Water flows into a Y-section. The flow is 0.5 cubic meters/sec. One section of the Y has a velocity of 12 m/s and a diameter of 18 cm. The other Y section has a diameter of 13 cm.. What is the velocity in the 13 cm section? 15 m/s 7.5 m/s 12 m/s 30 m/s Correct! Question 7 9/9 pts A water jet at 8 m/s with a diameter of 10 cm (circular) hits a flat plate. The flow spreads uniformly up and down the plate) no spray). What is the impact force? 500 N = 10 cm D = V; = 8 m/s 1000 N 2000 N 250 N Plate F Question 8 1 Water 2 P2 Pa= = 101 kPa h Mercury D1 = 8 cm with a water velocity of 5 m/s, D2 = 5 cm and h = 58 cm. First what is the gage pressure at 1? SG for mercury = 13.6 60000 Pa 77300 Pa Correct! 71600 Pa 6500 Pa 9/9 pts Correct! Question 9 Water 2 P2 Pa= = 101 kPa h Mercury 9/9 pts D1 = 8 cm with a water velocity of 5 m/s, D2 = 5 cm and h = 58 cm. What is the total force on the flange bolts? Make sure you inlude the pressure force AND momentum changes 320 N 165 N 126 N 360 N Question 10 9/9 pts Water flows in an elbow at a velocity of 3 m/s with a diameter of 4 cm. The inlet pressure is 20000 Pa gage and the exit is to atmosphere. The elbow makes a 90 degree turn. Neglect gravity. Find the elbow forces in the x and y direction (x is the direction the elbow begins before turning to the y direction. This question asks for x force, next question the y force. Vi F=P,A 25 N 3.8 N Correct! 36 N 21.2 N E=RA Ry Rx Question 11 from question 10 what is the Y force on the elbow? 25 N 7.6 N ON Correct! 11 N 10/10 pts