Which two observations help constrain the dimensions of earth's core and mantle?

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Which two observations help constrain the dimensions of earth&#039;s core and mantle?

Madden Krause · Accepted Answer

Earth&#039;s density and the wobble of Earth&#039;s rotation axis are the two observations that help constrain the dimensions of earth&#039;s core and mantle.Rotational motion around a fixed axis is a special case of rotational motion. The fixed axis hypothesis excludes the possibility of the axis changing direction and cannot describe phenomena such as oscillation or precession. According to Euler&#039;s rotation theorem, simultaneous rotation along several fixed axes at the same time is not possible; if two rotations are forced at the same time, a new axis of rotation will appear.This paper assumes that rotation is also stable, so no torque is required to maintain it. The kinematics and dynamics of the rotation of a rigid body about a fixed axis are mathematically much simpler than that of the free rotation of a rigid body; they are quite similar to linear motion in a single fixed direction, which is not true of the free motion of a rigid body. The expression for the body&#039;s kinetic energy and the force acting on its parts for rotation about a fixed axis is also simpler than for composite rotation.

Which two observations help constrain the dimensions of earth's core and mantle?

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