KAEA1151 ASSIGNMENT 2 (SEM2 20142015) 1) Describe at least three fluid properties

2) What is Pascal Law?

3) A 50cm x 30cm x 20cm block weighing 150N is to be moved at a constant velocity of

0.8m/s on an inclined surface with a friction coefficient of 0.27. (a) determine the force F

that needs to be applied in the horizontal directions. (b) if a 0.4mm thick oil film with a

dynamic viscosity of 0.012pa is applied between the block and inclined surface, determine

the percent reduction in the required force. (remember that friction force = friction

coefficient x force in vertical direction)

4) Define gauge pressure, atmospheric pressure, absolute pressure, barometer, manometer

and head of water

5) Vessels A and B shown in figure below contain water under pressure of 280,000N/m2 and

140,000N/m2 respectively. What is the deflection h of the mercury in the differential

gauge? (Apply equivalent head of water, h, for calculation. P = ρgh)

6) Freshwater and seawater flowing in parallel horizontal pipelines are connected to each

other by a double U-tube manometer. Determine the pressure difference between the two

pipelines. Take the density of seawater at that location to be 1035kg/m3 and density of

mercury to be 13600kg/m3 and density of water is 1000 kg/m3.

KAEA1151 ASSIGNMENT 2 (SEM2 20142015)

7) Define the resultant hydrostatic force acting on a submerged surface and the center of

pressure.

8) A long solid cylinder of radius 2m hinged at point A is used as an automatic gate, as

shown below. When the water level reaches 15m, the cylindrical gate opens by turning

about the hinge at point A. Determine the hydrostatic force on the cylinder and its line of

action when the gate opens.

9) What is the buoyant force?

10) A 170kg granite rock (ρ=2700 kg/m3) is dropped into a lake. A man dives in and tries to lift

the rock. Determine how much force the man needs to apply to lift it from the bottom of the

lake (density of water is 100 kg/m3).

Note: to convert unit to N = [1N / 1kg. m/s2]