An Airplane Is Flying in Horizontal Flight at a Constant

question 71

Multiple Choice

An airplane is flying in horizontal flight at a constant velocity. The weight of the airplane is 40,000 N. The wings produce a lift force that is perpendicular to the wings and a drag force that is parallel to the wings. The engine produces a forward thrust force of 2,000 N. Which of the following statements is true?

• A) The lift force on the airplane is zero.
• B) The drag force on the airplane is zero.
• C) The lift force on the airplane is 42,000 N upward.
• D) The drag force on the airplane is 38,000 N downward.
• E) The drag force on the airplane is 2,000 N backward.

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