Question

the amount of load that can be safely imposed on an airplane depends upon the ______. (5.c.2)
weight of the airplane.
abruptness with which the load is applied.
position of the center of gravity.
speed of the airplane.

when a leading edge device is lowered, it increases the wing’s _______. (5.b.2)
center of gravity.
camber.
dihedral.
all of the above

Explanation:

First Question

To determine the factor on which the safe load of an airplane depends, we analyze each option:

• Weight of the airplane: The structural design and strength of the airplane are related to its weight - carrying capacity. The maximum safe load is determined by the airplane's structural limits which are related to its weight (e.g., a heavier - built airplane can handle more load).
• Abruptness of load application: While abrupt loading can cause stress, the question is about the "amount" of load that can be safely imposed, not about the manner of application affecting the amount.
• Position of center of gravity: The center of gravity affects stability and control, not the maximum amount of load the airplane can take.
• Speed of the airplane: Speed affects aerodynamic forces like lift and drag, but not the maximum static load the airplane can safely carry.

So the amount of load that can be safely imposed on an airplane depends on the weight of the airplane.

When a leading - edge device (like a slat) is lowered:

• Center of gravity: Lowering a leading - edge device does not change the location of the center of gravity of the airplane (the center of gravity depends on the distribution of mass).
• Camber: The camber of a wing is the curvature of the wing's upper and lower surfaces. Leading - edge devices, when lowered, increase the curvature (camber) of the wing, which in turn increases lift at lower speeds.
• Dihedral: Dihedral is the upward angle of the wings from the horizontal. Lowering a leading - edge device has no effect on the dihedral angle.

So when a leading - edge device is lowered, it increases the wing's camber.

Answer:

A. weight of the airplane.

Second Question