According to Einstein, is a frame at rest on the earth's surface a reasonably accurate inertial frame (ignoring the earth's rotation)?
A) No, such a frame is accelerating upward.}
B) It is not a real inertial frame, but we can treat it as one if we ignore external gravitational forces acting on objects inside the frame.
C) Yes.
D) It depends (explain).

Question

Quizplus · Accepted Answer

A frame at rest on the Earth's surface is not an inertial frame because it is accelerating upward due to the Earth's gravitational pull. According to Einstein's general theory of relativity, this acceleration is equivalent to a gravitational field, which means that a frame at rest on Earth is not in free fall and thus not an inertial frame.

According to Einstein, Is a Frame at Rest on the Earth's