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, v2​ = ?

Water flows through a pipe that narrows from 75 mm to 50 mm in diameter. The velocity in the wide section is 2.75 m/s. Find the velocity v2 in the narrow section.

d1 = 75 mmd2 = 50 mmv1 = 2.75 m/s
v2 = m/s
2.Easy
12d1​ = 200 mm, v1​ = 0.75 m/sd2​ = 50 mm

Water flows at 0.75 m/s through the wide section of the pipe, which has a diameter of 200 mm. Find the volume flow rate Q.

d1 = 200 mmd2 = 50 mmv1 = 0.75 m/s
Q = L/s
3.Medium
12d1​ = 100 mm, p1​ = 170 kPad2​ = 50 mm, p2​ = ?

Water flows through a horizontal pipe that narrows from 100 mm to 50 mm. In the wide section the pressure is 170 kPa and the velocity is 0.5 m/s. Ignoring losses, find the pressure p2 in the narrow section.

d1 = 100 mmd2 = 50 mmp1 = 170 kPav1 = 0.5 m/sρ = 1000 kg/m³
p2 = kPa
4.Medium
v = ?p0​pp0​ − p = 100 Pastagnation point

A pitot-static tube in a wind tunnel reads a difference of 100 Pa between the stagnation pressure and the static pressure. The air density is 1.2 kg/m³. Find the air speed v.

p0 − p = 100 Paρ = 1.2 kg/m³
v = m/s
5.Hard
12d1​ = 75 mm, p1​ = 190 kPad2​ = 40 mm, p2​ = ?Δz = 5 m

Water flows up through a pipe that narrows from 75 mm to 40 mm while rising 5 m. At section 1 the pressure is 190 kPa and the velocity is 3 m/s. Ignoring losses, find the pressure p2 at section 2.

d1 = 75 mmd2 = 40 mmp1 = 190 kPav1 = 3 m/sΔz = 5 mρ = 1000 kg/m³
p2 = kPa
6.Hard
d1​ = 150 mmd2​ = 75 mm12Δh = 150 mmmercuryQ = ?

A horizontal venturi meter (inlet 150 mm, throat 75 mm) carries water. A mercury U-tube manometer connected between the inlet and the throat shows a level difference of 150 mm. The discharge coefficient is 0.98. Find the flow rate Q. Use ρ = 1000 kg/m³ for water, 13 600 kg/m³ for mercury and g = 9.81 m/s².

d1 = 150 mmd2 = 75 mmΔh = 150 mmCd = 0.98ρHg = 13 600 kg/m³g = 9.81 m/s²
Q = L/s

Answer key

  1. 1. v2 = 6.188 m/s
  2. 2. Q = 23.56 L/s
  3. 3. p2 = 168.1 kPa
  4. 4. v = 12.91 m/s
  5. 5. p2 = 89.83 kPa
  6. 6. Q = 27.23 L/s

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