Question

A helicopter is moving to the right at a constant horizontal velocity. It experience three forces , and force on it caused by rotor . Which of the following diagrams can be a correct free-body diagram representing force on the helicopter? 

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A
B
C
D
Medium

Solution

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Correct option is
C

It is given that the helicopter is moving with constant horizontal velocity  
1. We know that drag force is always opposite to the motion.
2. Rotor Force is perpendicular to the plane of rotation of rotors.
3. And the gravity acts downwards.

Hence Option C is  correct  

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