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qid 12205 · engineering

Question: The wings of anaeroplanehave a total plan area of 320 ft^2 The plane weighs 18,000lbf, and the normal speed in level flightis 230 ft/sec when the atmospheric density is 0.076lbm/ft^3. (a) If thetailplanecontributes 5 percent of thetotal liftforce, whatmust be the lift coefficient of the wings at this operating condition ? (b) If, at the same flight condition, the drag coefficient of the wingsis 0.055, and the total drag is 1.75 times that caused bythe wings alone, what forward thrust is required? Ignore interferencebetween the wings and the fuselage.

  1. 0.85, 1937lbf
  2. 0.80, 1987lbf
  3. 0.95, 1837lbf
  4. 0.70, 2087lbf
  5. 0.78, 2032lbf
  6. 1.00, 1787lbf
  7. 0.90, 1887lbf
  8. 0.75, 2037lbf
  9. 0.60, 2187lbf
  10. 0.65, 2137lbf

Our answer: A. 0.85, 1937lbf Source quote machine-checked (exact quote)

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How it was answered

Multi-step solver (maze), replayed by code

card: maze · card sha256 92e9748b61bf24b1…

Current source

NASA Glenn Research Center, Beginner's Guide to Aeronautics, "The Lift Equation"

https://www1.grc.nasa.gov/beginners-guide-to-aeronautics/lift-equation/

“One way to deal with complex dependencies is to characterize the dependence by a single variable. For lift, this variable is called the lift coefficient, designated”

Source quote machine-checked (exact quote)

retrieved 2026-09-18T02:26:50.265Z

page text sha256 4e3c683b7b414fa8… · content sha256 8ef7cdbe36306fe7…

addendum maze_qid12205_b4_maze_input_ADDENDUM_source_rs20260918T022650Z · sha256 7c29787c7c5587c1… · replaces the version below, addendum sha256 0150149903c94738…

Earlier version (superseded)

No public source has been found for this card yet (3 places checked internally).

addendum maze_qid12205_b4_maze_input_ADDENDUM_source · sha256 0150149903c94738…

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