The ellipsoid is rotational symmetric with the x-axis as axis of rotation and formula 87. It is the inertia of a rotating body with respect to its rotation. The effect is a rotation with uniform angular velocity around a fixed rotation axis. This is because the velocity of the instantaneous axis of rotation is zero. Let formula 3 be their perpendicular distances from the axis of rotation. This is the matrix for a rotation around axis by the angle . Cyclic twins are caused by repeated twinning around a rotation axis. A Laser flip combined with a frontside 180-degree body rotation in the same direction. Uniform circular motion refers to the case of constant rate of rotation. A displacement consists of the combination of a rotation and a translation. A bigflip is a 360 flip combined with a backside 180-degree body rotation. A Frightmare flip is a nightmare flip with a frontside 180-degree body rotation. The farm practices a strict five year crop rotation. Many challenges exist within the practices associated with crop rotation. They are arranged to follow one another in a regular rotation of subjects.