Question

1. The pressure exerted by a force on an area is greater when the area is:

reduced

increased

expanded

None of the above

2. When a fluid is in equilibrium, the vector sum of the vector forces of the vertical forces on the fluid element must be:

A scalar

different from zero

equal to zero

None of the above

3. When a body is submerged in a fluid the sum of forces gives us the force as an equivalence:

normal

tangential

buoyant

None of the above

4. The water runs towards a source filling all the tubes at a constant rate of 0.750 m ^ 3 / s, the speed with which it will come out of a 4.50 cm diameter hole is:

3.58m / s

4.72m / s

5.73m / s

None of the above

5. A barrel contains an oil layer of 0.120 over 0.250 of water. The density of the oil is 600 kg / m ^ 3. The gauge pressure at the oil-water interface is:

760Pa

50Pa

200Pa

None of the above

6. The water flows upwards from a hose in a patio leaving the nozzle at a speed of 15m / s. Using Bernoulli's equation, the height that the water reaches is:

8.50m

10.0m

11.5m

None of the above

7. The hydraulic jack of a car illustrates:

Hooke's Law

Newton's third law

Pascal's principle

None of the above

8. One hydraulic press has a 2.0cm diameter piston and another piston has a 8.0cm diameter. What force must be applied to the smallest piston to balance a 1600N force to the largest piston?

6.25N

25N

400N

None of the above

9. A spruce wood board floats in fresh water with 60% of its volume underwater. Its density in g / cm ^ 3 is:

0.6

0.5

0.4

None of the above

10. Bernoulli's equation is a derivation of the Conservation Law from:

mass

Energy

linear momentum

None of the above

Answer 1

1. The pressure exerted by a force on an area is greater when the area is:

REDUCED

Because P=F/A

2. ZERO

This happens because fluid is in equilibrium

3.

When a body is submerged in a fluid the sum of forces gives us the force as an equivalence:

normal

BUOYANT FORCE

4.

he water runs towards a source filling all the tubes at a constant rate of 0.750 m ^ 3 / s, the speed with which it will come out of a 4.50 cm diameter hole is:

RATE/AREA= 0.750/pir^2= OPTION B 4.72 m/s

5. pgh= .120*600*10=720

NONE OF THESE

6. H=v2/2g=11.5 m

7.Hydroulic jack is example of pascals law

it is based on principal of p=f/a

8. inverse ration of area

since radius is 4 times

area is 16 times

so force is 1/16 times of 100 N

NONE OF THESE

9. 0.6

1-(1-0.6)=0..6

here 1 was specific gravity of water

10. bernoulis theoram is based on conservation of energy

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