Final answer:
The Apache helicopter hangs left-side low due to the torque effect caused by the main rotor. The tail rotor counteracts the torque force to keep the helicopter balanced.
Step-by-step explanation:
The reason an Apache helicopter hangs left-side low is due to the torque effect caused by the main rotor. The main rotor spins counterclockwise, creating a torque force that tends to rotate the helicopter in the opposite direction (clockwise) to maintain momentum conservation. To counteract this torque force, the Apache's tail rotor produces a thrust force in the opposite direction to keep the helicopter balanced.
This imbalance in torque forces causes the Apache to hang left-side low. The tail rotor generates a thrust force that pushes the helicopter in the opposite direction of the torque force, balancing the overall forces and preventing the helicopter from spinning uncontrollably.
It is important to note that this phenomenon is specific to helicopters with a counterclockwise spinning rotor system. Helicopters with a clockwise spinning rotor system would experience a low tendency on the right side.