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An oblique shock is most usefully understood as a normal shock acting on

  • A.The speed of sound alone
  • B.The velocity component perpendicular to the shock
  • C.The velocity component parallel to the shock
  • D.The full velocity vector

Answer: B

The component tangential to an oblique shock is unchanged across it, while the normal component behaves exactly as it would through a normal shock. Every normal shock relation can therefore be reused for an oblique shock simply by replacing the Mach number with the Mach number based on the normal component.

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