1. QUESTIONS

6. Buoyancy  F b =  f  o  o submerged volume of object

7. Examples  Car ferry: (25x300) ft 2 ; 60 cars, each weighs 3000lbf. Depth of submergence?  50gal empty drum an aid to lift anchor weighing 400lbf. Submerged in seawater 64 lbf / ft 3. Force supplied by diver?

8. Examples  Hydrometer sinks 5.3cm into water at 15 o C. Bulb displaces 1.0cc; stem area 0.1cm 2. Hydrometer weight?

9. Homework  Concrete block at 100lbf in air and 60lbf in water; what is  of block?  Rectangular pontoon has width = 6m, length = 12m, and draught = 1.5m. In fresh water. What is weight? Draught in water at 1025 kg / m 2 ? Load supported in fresh water?

10. Buoyancy  Mott Chapter 5  Practice 5.3 5.4 5.5 5.13

11. Schedule  Chapters 1 through 5: pressure, forces on submerged surfaces, buoyancy  1/22 One minute paper  1/24 response  1/29 Test 1

12. Fluid dynamics  Fluids in motion Pumps Fans Compressors Turbines Heat exchangers

13. Conservation  Energy & mass; neither created nor destroyed in ordinary process  Control volume  Steady state: no accumulation nor depletion

16. Flowing fluid  Steady flow  Uniform flow  Mass flow rate: Kg/ time, lbm/time  Volume flow rate: m 3 /time, ft 3 /time, cfm, gpm