While flying horizontally in an airplane,you notice that a string dangling from the luggage compartment hangs at rest at 15 degrees away from the vertical.Using this observation,you can conclude that the airplane is an inertial reference frame because the string is not moving.

Question

Quizplus · Accepted Answer

An inertial reference frame is one in which objects move at constant velocity unless acted upon by a force. The string hanging at an angle indicates a net force acting on it, suggesting the airplane is accelerating and thus not an inertial reference frame.

While Flying Horizontally in an Airplane,you Notice That a String