Question: Question 4 Tick all the correct statements below: if a flow starts irrotational and there are no viscous forces, the flow will remain irrotational unsteady

Question 4
Tick all the correct statements below:
if a flow starts irrotational and there are no viscous forces, the flow will remain irrotational
unsteady flows are always irrotational
whenever viscous forces are present, the flow is rotational
inviscid flows are always irrotational
Question 4 Tick all the correct statements below:

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