An isolated electron that is not undergoing acceleration is unable to emit or absorb a real photon; doing so would violate conservation of energy and momentum.

A rigid body in mechanical equilibrium is undergoing neither linear nor rotational acceleration; however it could be translating or rotating at a constant velocity.

As long as the ride is turning at a constant rate you would be undergoing constant acceleration.

Gravitational waves are a type of radiation that is emitted by objects that have mass and are undergoing acceleration.

Conversely, a bike is longitudinally stable when stationary and can be longitudinally unstable when undergoing sufficient acceleration or deceleration.

As the streams collide and release energy in a circle, as dictated by the EM matrix, the whole mass undergoes tremendous acceleration.

Perhaps we could be on a spaceship undergoing constant acceleration, but I doubt that also-I believe we would hear the rockets.

A non-inertial reference frame is a frame of reference that is undergoing acceleration with respect to an inertial frame.

I don't know about all the others, but Norrey and I and anybody sensible customarily underwent acceleration naked.

Most natural satellites of the planets undergo tidal acceleration to some degree (usually small), except for the two classes of tidally decelerated bodies.