Which risk increases when helicopter rotor tip speed approaches supersonic?

💡 Explanation

Approaching supersonic speeds causes compressibility leading to shock waves. Increased wave drag results from the shock-induced pressure increase downstream; this happens because the local Mach number affects the drag coefficient, therefore wave drag increase rather than those other consequences in subsonic regimes.

• Which consequence results when imperfections disrupt crystal lattice periodicity in a piezoelectric transducer?
• Which risk increases when a steel pipeline experiences sustained electromagnetic interference?
• Which inefficiency increases in a high-power steam turbine when rapid load changes cause water droplet formation?
• Which outcome is likely at a black hole's event horizon because of Einstein's equivalence principle?
• Which risk increases when an electron's wavefunction overlaps a nonsymmetrical potential well?
• Inside uranium enrichment centrifuges, which consequence arises when hexafluoride gas feed rate exceeds limits?