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Question 19M.3.HL.TZ1.10a

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.HL.TZ1.10a
Level HL Paper 3 Time zone TZ1
Command term State Question number a Adapted from N/A
a.
[Maximum mark: 1]
19M.3.HL.TZ1.10a
(a)

State one condition that must be satisfied for the Bernoulli equation

1 2 ρv2 + ρgz + ρ = constant

to apply

[1]

Markscheme

flow must be laminar/steady/not turbulent ✔

fluid must be incompressible/have constant density ✔

fluid must be non viscous ✔

Examiners report

Gasoline in a pipe. In a), most of the candidates well noted that for the Bernoulli equation, the fluid must be” non-viscous”, some noted, “laminar” and a few, “incompressible”. Some students stated vaguer and less concrete responses such as “the fluid must be ideal”.

Syllabus sections