Pressure and depth
3 marks · EasyA rectangular tank is filled with a liquid to a depth of 1.2 m. The density of the liquid is 950 kg/m³. g = 10 N/kg.
Calculate the pressure at the bottom of the tank due to the liquid.
State one way to increase the pressure at the bottom of the tank.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) 11,400 Pa
(b) — · must show increase the depth, increase the density of liquid
Common mistakes: Using wrong density or height
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Marking points
M1 (a) · 1 mark · Substitutes correctly into p = h × ρ × g
A1 (a) · 1 mark · Pressure calculated correctly: 11,400 Pa
B1 (b) · 1 mark · States a correct method, e.g. increase depth or liquid density
Worked solution
(a) p = h × ρ × g = 1.2 × 950 × 10 = 11,400 Pa
(b) Increase the depth of the liquid, increase its density, or increase g.