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
vd = 10 mmh = 4 m

An open water tank drains through a round opening with a diameter of 10 mm in its side. The free surface is 4 m above the opening. Ignoring losses and the contraction of the jet, find the flow rate Q. Use g = 9.81 m/s².

h = 4 mg = 9.81 m/s²d = 10 mm
Q = L/s
2.Easy
12d1​ = 150 mm, v1​ = 1.5 m/sd2​ = 100 mm, v2​ = ?

Water flows through a pipe that narrows from 150 mm to 100 mm in diameter. The velocity in the wide section is 1.5 m/s. Find the velocity v2 in the narrow section.

d1 = 150 mmd2 = 100 mmv1 = 1.5 m/s
v2 = m/s
3.Medium
12d1​ = 75 mm, p1​ = 270 kPad2​ = 50 mm, p2​ = ?

Water flows through a horizontal pipe that narrows from 75 mm to 50 mm. In the wide section the pressure is 270 kPa and the velocity is 0.75 m/s. Ignoring losses, find the pressure p2 in the narrow section.

d1 = 75 mmd2 = 50 mmp1 = 270 kPav1 = 0.75 m/sρ = 1000 kg/m³
p2 = kPa
4.Medium
12d1​ = 100 mm, p1​ = 350 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 350 kPa and the velocity is 0.5 m/s. Ignoring losses, find the pressure p2 in the narrow section.

d1 = 100 mmd2 = 50 mmp1 = 350 kPav1 = 0.5 m/sρ = 1000 kg/m³
p2 = kPa
5.Hard
12d1​ = 200 mm, p1​ = 320 kPad2​ = 75 mm, p2​ = ?Δz = 1 m

Water flows up through a pipe that narrows from 200 mm to 75 mm while rising 1 m. At section 1 the pressure is 320 kPa and the velocity is 0.5 m/s. Ignoring losses, find the pressure p2 at section 2.

d1 = 200 mmd2 = 75 mmp1 = 320 kPav1 = 0.5 m/sΔz = 1 mρ = 1000 kg/m³
p2 = kPa
6.Hard
pair​ = 130 kPav = ?d = 40 mmh = 2 m

A closed water tank has compressed air above the water at a gauge pressure of 130 kPa. Water leaves through an opening with a diameter of 40 mm, 2 m below the water surface, into the open air. Ignoring losses, find the jet velocity v. Use g = 9.81 m/s².

pair = 130 kPa (gauge)h = 2 md = 40 mmρ = 1000 kg/m³g = 9.81 m/s²
v = m/s

Answer key

  1. 1. Q = 0.6958 L/s
  2. 2. v2 = 3.375 m/s
  3. 3. p2 = 268.9 kPa
  4. 4. p2 = 348.1 kPa
  5. 5. p2 = 304 kPa
  6. 6. v = 17.3 m/s

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