Continuity & Bernoulli worksheet with answers

Free printable Continuity & Bernoulli worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
12d1​ = 75 mm, v1​ = 2.75 m/sd2​ = 50 mm

Water flows at 2.75 m/s through the wide section of the pipe, which has a diameter of 75 mm. Find the volume flow rate Q.

d1 = 75 mmd2 = 50 mmv1 = 2.75 m/s
Q = L/s
2.Easy
12d1​ = 75 mm, v1​ = 1.25 m/sd2​ = 25 mm

Water flows at 1.25 m/s through the wide section of the pipe, which has a diameter of 75 mm. Find the volume flow rate Q.

d1 = 75 mmd2 = 25 mmv1 = 1.25 m/s
Q = L/s
3.Medium
12d1​ = 150 mm, p1​ = 230 kPad2​ = 40 mm, p2​ = ?

Water flows through a horizontal pipe that narrows from 150 mm to 40 mm. In the wide section the pressure is 230 kPa and the velocity is 1 m/s. Ignoring losses, find the pressure p2 in the narrow section.

d1 = 150 mmd2 = 40 mmp1 = 230 kPav1 = 1 m/sρ = 1000 kg/m³
p2 = kPa
4.Medium
d1​ = 100 mmd2​ = 50 mm12p1​ − p2​ = 38 kPaQ = ?

Water flows through a horizontal venturi meter with an inlet diameter of 100 mm and a throat diameter of 50 mm. The pressure at the inlet is 38 kPa higher than at the throat. Ignoring losses, find the flow rate Q.

d1 = 100 mmd2 = 50 mmp1 − p2 = 38 kPaρ = 1000 kg/m³
Q = L/s
5.Hard
12d1​ = 150 mm, p1​ = 400 kPad2​ = 75 mm, p2​ = ?Δz = 10 m

Water flows up through a pipe that narrows from 150 mm to 75 mm while rising 10 m. At section 1 the pressure is 400 kPa and the velocity is 2 m/s. Ignoring losses, find the pressure p2 at section 2.

d1 = 150 mmd2 = 75 mmp1 = 400 kPav1 = 2 m/sΔz = 10 mρ = 1000 kg/m³
p2 = kPa
6.Hard
12d1​ = 150 mm, p1​ = 250 kPad2​ = 100 mm, p2​ = ?Δz = 7 m

Water flows up through a pipe that narrows from 150 mm to 100 mm while rising 7 m. At section 1 the pressure is 250 kPa and the velocity is 2.25 m/s. Ignoring losses, find the pressure p2 at section 2.

d1 = 150 mmd2 = 100 mmp1 = 250 kPav1 = 2.25 m/sΔz = 7 mρ = 1000 kg/m³
p2 = kPa

Answer key

  1. 1. Q = 12.15 L/s
  2. 2. Q = 5.522 L/s
  3. 3. p2 = 131.6 kPa
  4. 4. Q = 17.68 L/s
  5. 5. p2 = 271.9 kPa
  6. 6. p2 = 171 kPa

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