Discussion
Assertion (A): The tangential velocity component is unchanged across an oblique shock.
Reason (R): No pressure gradient acts along the shock surface.
Select the correct answer from the options below.
Answer: B
Both are true and the second explains the first. Applying momentum conservation in the direction along the shock, where the pressure difference has no component, leaves the tangential velocity untouched. Only the normal component is processed, which is what makes the oblique shock reducible to a normal shock problem.
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