Final answer:
The provided choices relate to rotational speed and are not applicable to stall speed in aircraft. Reducing power from take-off to idle typically increases the stall speed due to a decrease in lift generation, but the exact speed change cannot be determined from the given options.
Step-by-step explanation:
The question revolves around the concept of stall speed in an aircraft, which is a physics-related topic. When power is reduced from take-off (T/O) to idle in an aircraft, this affects the lift generated by the wings. The stall speed is the minimum speed at which an aircraft can maintain level flight. The main answer to the question is not provided in the choices given, as they refer to a rotational speed (revolutions per second) rather than a stall speed. However, it's essential to understand that reducing power will generally lead to a decrease in airspeed, and if this airspeed falls below the stall speed, the aircraft will no longer be able to maintain lift, resulting in a stall. Therefore, reducing power from take-off to idle will increase the stall speed because the wings will require a higher speed to generate the same amount of lift at a lower power setting.In conclusion, the increase in stall speed occurs because with less engine power, the wings have to work harder (i.e., require a higher airspeed) to produce the lift necessary to sustain flight.