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​ = 1 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 1 m/s. Find the velocity v2 in the narrow section.

d1 = 75 mmd2 = 50 mmv1 = 1 m/s
v2 = m/s
2.Easy
12d1​ = 200 mm, v1​ = 1.75 m/sd2​ = 75 mm

Water flows at 1.75 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 = 75 mmv1 = 1.75 m/s
Q = L/s
3.Medium
d1​ = 100 mmd2​ = 50 mm12p1​ − p2​ = 43 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 43 kPa higher than at the throat. Ignoring losses, find the flow rate Q.

d1 = 100 mmd2 = 50 mmp1 − p2 = 43 kPaρ = 1000 kg/m³
Q = L/s
4.Medium
12d1​ = 150 mm, p1​ = 270 kPad2​ = 75 mm, p2​ = ?

Water flows through a horizontal pipe that narrows from 150 mm to 75 mm. In the wide section the pressure is 270 kPa and the velocity is 2.25 m/s. Ignoring losses, find the pressure p2 in the narrow section.

d1 = 150 mmd2 = 75 mmp1 = 270 kPav1 = 2.25 m/sρ = 1000 kg/m³
p2 = kPa
5.Hard
pair​ = 160 kPav = ?d = 40 mmh = 1.5 m

A closed water tank has compressed air above the water at a gauge pressure of 160 kPa. Water leaves through an opening with a diameter of 40 mm, 1.5 m below the water surface, into the open air. Ignoring losses, find the jet velocity v. Use g = 9.81 m/s².

pair = 160 kPa (gauge)h = 1.5 md = 40 mmρ = 1000 kg/m³g = 9.81 m/s²
v = m/s
6.Hard
12d1​ = 100 mm, p1​ = 240 kPad2​ = 75 mm, p2​ = ?Δz = 7 m

Water flows up through a pipe that narrows from 100 mm to 75 mm while rising 7 m. At section 1 the pressure is 240 kPa and the velocity is 0.5 m/s. Ignoring losses, find the pressure p2 at section 2.

d1 = 100 mmd2 = 75 mmp1 = 240 kPav1 = 0.5 m/sΔz = 7 mρ = 1000 kg/m³
p2 = kPa

Answer key

  1. 1. v2 = 2.25 m/s
  2. 2. Q = 54.98 L/s
  3. 3. Q = 18.81 L/s
  4. 4. p2 = 232 kPa
  5. 5. v = 18.69 m/s
  6. 6. p2 = 171.1 kPa

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