Pressure Revision

Two wooden cubes, X and Y, are placed onto the same surface. Y has sides that are twice as long as X. If the pressure exerted by X on the surface is P, what will be the pressure exerted by Y?

• 2P

• 4P

• 8P

• 16P

Five blocks have the same mass but different base areas. They all rest on a horizontal table.

A graph is plotted to show the relationship between the pressure exerted on the table and the base area of the block. Which graph shows the relationship?

• 
• 
• 
• 

The diagram shows a simple hydraulic jack. Which of the following alterations will enable heavier loads to be lifted?

• Diameter of W - Doubled

• Diameter of Z - Doubled

• Diameter of W - Halved

• Diameter of Z - Halved

The diagram shows the principle of a hydraulic system.

The cross-sectional area of the master cylinder is 12.0 cm^2 and the cross-sectional area of the slave cylinder is 8.0cm^2. The force applied to the master piston is 120N. Which of the following are correct?

• Pressure at slave - 0.10 N/cm^2

• Pressure at slave - 10.0 N/cm^2

• Force at slave - 80 N

• Force at slave - 180 N

The diagram shows two syringes connected by a rubber tube. The space between the two pistons is filled with a liquid. The areas of the small piston ad the large piston are 2cm^2 and 10cm^2 respectively. A force of 10N is applied to the small piston. What is the ratio of the pressure acting on the smaller piston to the pressure acting on the larger piston?

• 1:1

• 1:2

• 1:5

• 5:1

The diagrams show, to the same scale, the vertical sections of a set of circular vessels. Each vessel contains the same depth of water.

Which of the following statements is correct?

• The water exerts the greatest pressure on base of P

• The water exerts the greatest pressure on base of S

• The water exerts the same force on the base of each vessel

• The water exerts the same pressure on the base of each vessel

Water is contained in a container of base area A1 up to height h1. Some water is contained in a second container of bigger base area A2 but up to a smaller height h2. The pressure exerted on base A1 is P1 while that exerted on A 2 is P2.

Which of the following statements is correct?

• P1 > P2 since h1 > h2

• P1 < P2 since A2 > A1

• P > P2 since A2 > A1

• It is possible that P1 = P2 since A2 > A1 and h1 > h2

The RSS Archer is cruising at a depth of 65m. The density of seawater is 1020 kg/m^3. If the atmospheric pressure is 10^5 Pa, what is the pressure acting on the submarine at this depth?

• 66 300

• 166 300

• 663 000

• 763 000

A solid block of material density r, height h and horizontal surface area A is immersed in a liquid. The pressures of the liquid at the upper and lower surfaces are p1 and p2 respectively.

What is the difference in force between the upper and lower surfaces?

• Ahrg

• Ahrg + p1 x A

• p2 x A

• p2 x A - p1 x A

The diagram shows an air bubble at the bottom of a pool. Assuming that the temperature of the pool is constant throughout the water, which if the following describes the change of pressure and the density of the air in the bubble as it rises to the surface?

• Pressure - decreases

• Pressure - increases

• Density - decreases

• Density - increases