1) The diagram shows a simple mercury barometer.

When the mercury barometer is brought to the top of a mountain, the height h of the mercury column decreases.

Which statement explains this?

2) A 95.0 kg table exerts a pressure of 1.05 kPa on its legs. When a man climbs on top of it, the pressure exerted on its legs increased to 1.90 kPa.

What is the weight of the man?

3) A water manometer is connected to a gas supply. The diagram shows the water levels.

The water is replaced by mercury, which is more dense than water.

Which diagram shows the mercury levels when the manometer is connected to the same gas supply?

4) The diagram below shows the structure of a simple hydraulic lift. When a force F is applied at M, a force is set up at N to lift a load.

What is the magnitude of force F exerted in order to lift a load of 80N at N?

5) One side of a vertical garden fence has an area of 4.0 m². A strong wind blows on one side of the fence and increases the pressure to 105 kPa. The pressure on the other side of the fence is 103 kPa.

What is the resultant force on the fence?