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ENGINEERING, AE 2017 HSC 26a

The flaps of an executive jet are controlled using a hydraulic system. A force of 1 kN acts on the 40 mm diameter master piston.
 

What force would need to be developed to move the flap if the slave piston has a diameter of 100 mm?   (3 marks)

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`6.25\ text{kN}`

Show Worked Solution

`P=F/A`

`1000/(pi xx 20^2)` `=F_S/(pi xx 50^2)`  
`F_S` `=(1000 xx pi xx 50^2)/(pi xx 20^2)`  
  `=6250\ text{N}`  
  `=6.25\ text{kN}`  

ENGINEERING, AE 2019 HSC 10 MC

The diagram shows the airflow in a venturi.
 

What does this diagram illustrate?

  1. Coriolis effect
  2. Pascal's principle
  3. Dynamic pressure
  4. Bernoulli's principle
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`D`

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→ Bernoulli’s principle states that the higher the pressure is, the lower the velocity will be.

→ This is illustrated in the diagram as it shows that there is a decreased pressure in the thinner, higher velocity section.

`=>D`


♦ Mean mark 55%.