Two things that can be increased when density is decreased to maintain lift are:

Two things that can be increased when density is decreased to maintain lift are:

• A. Wing Area
• B. Engine Power
• C. AOA or Airspeed
• D. Flap Setting

Answer: (C)

When density drops, lift tends to fall because there’s less air to push against. Lift is proportional to density, speed squared, wing area, and the lift coefficient. To keep lift up as density decreases, you can either increase speed or increase the lift coefficient. The lift coefficient rises with angle of attack, so increasing the angle of attack (within safe limits to avoid a stall) will increase lift. Another route is increasing airspeed, which raises the dynamic pressure and thus lift. Wing area is fixed for a given aircraft during flight, and engine power mainly helps you achieve higher airspeed rather than directly increasing lift itself. Flap settings can boost lift at lower speeds, but they’re not the primary response to lower density in normal cruise and also add drag. So the two straightforward ways to maintain lift when density falls are increasing the angle of attack or increasing airspeed.

When density drops, lift tends to fall because there’s less air to push against. Lift is proportional to density, speed squared, wing area, and the lift coefficient. To keep lift up as density decreases, you can either increase speed or increase the lift coefficient. The lift coefficient rises with angle of attack, so increasing the angle of attack (within safe limits to avoid a stall) will increase lift. Another route is increasing airspeed, which raises the dynamic pressure and thus lift.

Wing area is fixed for a given aircraft during flight, and engine power mainly helps you achieve higher airspeed rather than directly increasing lift itself. Flap settings can boost lift at lower speeds, but they’re not the primary response to lower density in normal cruise and also add drag. So the two straightforward ways to maintain lift when density falls are increasing the angle of attack or increasing airspeed.