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If the friction is neglected, then_______

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in Fluid Mechanics by (118k points)
If the friction is neglected, then_______

(a) Vr1 > Vr2

(b) Vr1 < Vr2

(c) Vr1 = Vr2

(d) Vr1 is a zero

I have been asked this question at a job interview.

Query is from Drag on a Sphere topic in portion Boundary Layer Flow & Forces on Sub-merged Bodies of Fluid Mechanics

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Right answer is (c) Vr1 = Vr2

To explain: The relative velocity of the jet is denoted as Vr1. It is the relative velocity at the inlet to the vane. Relative velocity of inlet to the vane is obtained by subtracting vectorially the velocity of the vane with its absolute velocity. It happens in the same way for Vr2. Thus, If the friction is neglected, then Vr1= Vr2.

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