Pressure and Fluids Quiz

Pressure at a depth h in a liquid is mathematically expressed as ____, where ρ and g are density of the liquid and acceleration due to gravity respectively.

• P= mgh

• P = ρg/h

• P = ρgh

• P = ρmg

Find the pressure on the bottom of a swimming pool that measures 8.0 m by 15.0 m and has a uniform depth is 2.0 m. Note: the density of water is 1000 kg/m³.

• 5.6 x 10³ Pa

• 1.96 x 10⁴ Pa

• 6.83 x 10⁵ Pa

• 2.74 x 10² Pa

If an external pressure is exerted at the surface, this must also be taken into account. A SCUBA diver descends 15 m into a lake. If the pressure at the surface of the lake is 101300 Pa calculate the water pressure at a 15 m depth. density of fresh water = 1000 kg/m³

• 141.3 kPa

• 1.0813 kPa

• 591.3 kPa

• 248.3 kPa

Ouch! You stepped on my foot! That is, you put a force of 550 N in an area of 9 cm² on the tops of my feet! The pressure on my feet was 611111 Pa. What is the ratio of this pressure to atmospheric pressure?

9 cm³ = 0.0009 m³ & 1 atm = 101325 Pa

• 2.5 atm

• 8.2 atm

• 6 atm

• 4 atm

A brick of gold is 10.0 cm wide, 10.0 cm high and 20.0 cm long. The density of gold is 19.3 g/cm³. What pressure does the brick exert on the table if it is resting on its end?

• 1890 Pa

• 3780 Pa

• 3860 Pa

A brick of gold is 10.0 cm wide, 10.0 cm high and 20.0 cm long. The density of gold is 19.3 g/cm³. What pressure does the brick exert on the table if it is resting on its side?

• 1890 Pa

• 3780 Pa

• 3860 Pa

A rectangular block weighing 150 N is resting on a flat surface. If the area of contact between the block and the surface is 0.25 m², what is the pressure (Pa) exerted by the block on the surface?

A woman wearing high heels steps onto a soft wooden floor. Each heel has a cross-sectional area of 1.5 cm² and the woman's weight is 600 N. Calculate the pressure (Pa) exerted on the floor by one heel. 1 m² = 10000 cm²

A cylindrical piston has a diameter of 8 cm and exerts a force of 400 N on the fluid inside a hydraulic system. Calculate the pressure (Pa) applied by the piston on the fluid. Hint: area of a circle, 1 m² = 10000 cm²

A physics book is lying flat on a table. The book weighs 10 N and has dimensions of 20 cm by 30 cm. What is the pressure (Pa) exerted on the table? 1 m² = 10000 cm²