The answer is B: Can you please tell me why the answer is B? The answer does not

Question

The answer is B:

Can you please tell me why the answer is B?

The answer does not depend on Newton's 3rd Law.
I appreciate your help!

4. (10 points) Some helicopters have two rotors that rotate in opposite directions as shown.If instead, they both rotated in opposite directions as shown.Iif instead, they both rotated in the clockwise direction as seen from above, what would happen to the body of the helicopter if the pilot increased the rotation speed of both rotors? A. The body would rotate clockwise. B. The body would rotate counterclockwise. C. Nothing-there would be no effect on the body. D. The answer depends on how fast the rotors rotate. E. The answer depends on the mass of the helicopter body. Rear rotor Front rotor rotates clockwise counterclockwise rotates

Explanation / Answer

The pupose of rotor is to create a net zero torque and to provide thrust to allow the plane to move forward and lift its weight.

Imagine if both rotor start rotating in clockwise direction so what they are doing is they will provide some torque on the plane.If both are rotating in clockwise direction with increased speed means torque=I*angular acclerartion will not be zero now,the net torque will be toward counterclockwise direction on the plane so it will start rotationg counterclockwise direction

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