7 Pressure 2020J

A skier is standing still on a flat area of snow. The weight of the skier is 550 N. The total area of his skis in contact with the ground is 0.015 m². What is the pressure exerted on the ground by the skier?

• 0.83 N/m²

• 8.3 N/m²

• 3700 N/m²

• 37000 N/m²

A tall cylinder is partly filled with two liquids which do not mix. The two liquids have different densities. A student measures the pressure due to the liquids at different depths. Which graph shows how the liquid pressure varies between positions P and Q?

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The diagram shows a solid block resting on a bench. The dimensions of the block are shown. On which labelled surface should the block rest to produce the smallest pressure on the bench?

• P

• Q

• R

• P, Q and R produce the same pressure

Four submarines are submerged. The density of fresh water is 1000 kg/m³ and the density of sea water is 1020 kg/m³.

Which submarine experiences the greatest pressure due to the water?

• A

• B

• C

• D

A beaker contains a liquid.

On what does the liquid pressure at position X depend?

• both the density of the liquid and the depth of X below the surface

• both the surface area of the liquid and the depth of X below the surface

• both the surface area of the liquid and the volume of the liquid

• the depth of X below the surface only

The diagram shows a U-shaped glass tube, closed at one end by a tap. The glass tube contains a liquid as shown.

Some of the trapped gas is removed.

What will happen to the levels X and Y?

• level X higher,

  level Y lower

• level X higher,

  level Y higher

• level X lower,

  level Y higher

• level X lower,

  level Y lower

The pressure due to the liquid on an object immersed in that liquid is 4500 Pa.

The density of the liquid is 900 kg/m³.

What is the depth of the object below the surface of the liquid?

• 0.5 cm

• 2.0 cm

• 50 cm

• 200 cm

An object is 60 cm below the surface of a liquid. The pressure due to the liquid at this depth is 9000 Pa. What is the density of the liquid?

• 15 kg/m³

• 540 kg/m³

• 1500 kg/m³

• 54000 kg/m³

A pipe full of water connects a water supply on a hill to a tap lower down the hill.

The length of the pipe is 500 m. The height of the supply above the tap is 100 m.

The density of the water is 1000 kg/m³. The effect of atmospheric pressure is negligible.

What is the water pressure at the tap?

• 100 000 Pa

• 500 000 Pa

• 1 000 000 Pa

• 5 000 000 Pa