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What is overall drag force?

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What is overall drag force?

(a) The sum of drag force, zero-lift drag, lift-dependent drag and volume dependent wave drag

(b) The sum of lift-dependent drag and volume dependent wave drag

(c) The sum of drag force, lift-dependent drag and volume dependent wave drag

(d) The sum of drag force, zero-lift drag and lift-dependent drag

I got this question in unit test.

The origin of the question is Minimum Drag Speed in section Aircraft Force Systems and the Equations of Motion of Aircraft Performance

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Best answer
Correct choice is (a) The sum of drag force, zero-lift drag, lift-dependent drag and volume dependent wave drag

Explanation: Overall drag force is the sum of drag force, zero-lift drag, lift-dependent drag and volume dependent wave drag. It is given that the mach number is a function of all the mentioned factors.

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