Name and state the principle on which a hydraulic press works. Write one use of the hydraulic press.

Describe a simple experiment to demonstrate that a liquid enclosed in a vessel exerts pressure in all directions.

Explain the principle of a hydraulic machine. Name two devices which work on this principle.

The diagram in figure shows a device which makes use of the principle of transmission of pressure.

(a) Name the parts labelled by the letters X and Y.

(b) Describe what happens to the valves A and B and to the quantity of water in the two cylinders when the lever arm is moved down.

(c) Give reasons for what happens to the valves A and B in part (b).

(d) What happens when the release valve is opened ?

(e) What happens to the valve B in cylinder P when the lever arm is moved up ?

(f) Give a reason for your answer in part (e)

(g) State one use of the above device.