Density and Pressure

At a depth of 20 cm in a liquid of density 1800 kg m^–3, the pressure due to the liquid is p. Another liquid has a density of 1200 kg m^–3 . What is the pressure due to this liquid at a depth of 60 cm?

• p/2

• 3p/2

• 2p

• 3p

Liquids X and Y are stored in large open tanks. Liquids X and Y have densities of 800 kg m^–3 and 1200 kg m^–3 respectively. At what depths are the pressures equal?

• depth in liquid x = 8 m

  depth in liquid Y = 12 m

• depth in liquid x = 10 m

  depth in liquid Y = 10 m

• depth in liquid x = 15 m

  depth in liquid Y = 10 m

• depth in liquid x = 18 m

  depth in liquid Y = 8 m

Which force is caused by a pressure difference?

• friction

• upthrust

• viscous force

• weight

A submarine carries a pressure meter so that the crew can work out how far they are below the surface of the sea. At the surface, the meter indicates a pressure of 100 kPa. The density of seawater is 1030 kg m^–3 . What is the depth below the surface when the meter reads 450 kPa?

• 34.6 m

• 44.5 m

• 340 m

• 437 m

Atmospheric pressure at sea level has a value of 100 kPa. The density of sea water is 1020 kg m^-3 . At what depth in the sea would the total pressure be 110 kPa?

• 1.0 m

• 9.8 m

• 10 m

• 11 m

If a block has a mass of 125 g and a volume of 25 cm^3 what is its density?

• 5 g/cm^3

• 0.25 g/cm^3

• 625 g/cm^3

• 120 g/cm^3

If a man has a weight of 1000 N and his shoe has an area of 250 cm^2 the area he exerts when standing on two legs will be

• 2 N/cm^2

• 0.125 N/cm^2

• 4 N/cm^2

• 975 N/cm^2

The pressure exerted by a liquid on an immersed object depends on the:

• Volume of the object

• Mass of the object

• Density of the object

• Depth of the object in the liquid

A scuba diver experiences an increase in pressure as they dive deeper into the water. This is primarily due to:

• increased density of water

• decreased density of water

• increased gravitational pull underwater

• increased weight of the water above