When the engine of the plane is running, the vertical reaction that the ground e

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When the engine of the plane is running, the vertical reaction that the ground exerts on the wheel at (A) is measured as 616 lb. When the engine is turned off, however, the vertical reactions at (A) and (B) are 535 each. The difference in readings at (A) is caused by a couple acting on the propeller when the engine is running. This couple tends to overturn the plane counterclockwise, which is opposite to the propeller's clockwise rotation. (Figure 1)

When the engine of the plane is running, the vertical reaction that the ground exerts on the wheel at (A) is measured as 616 lb. When the engine is turned off, however, the vertical reactions at (A) and (B) are 535 each. The difference in readings at (A) is caused by a couple acting on the propeller when the engine is running. This couple tends to overturn the plane counterclockwise, which is opposite to the propeller's clockwise rotation. (Figure 1)

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