2009年10月2日 · Probably an easy one... So, I understand the idea of precession on a gyroscope: we've got the angular velocity vector, the angular momentum vector (same direction but times the inertia tensor), then a torque is applied => change in L …

2011年3月20日 · In summary, the Precession of Mercury's Orbit is caused by the curvature of space around a large mass, such as the sun. This curvature causes space to be slightly "conical", leading to a slightly later repetition of the orbit at each perihelion. This effect is known as precession and can be observed by measuring the perihelion of the orbit.

2017年10月16日 · If the body is flat, the precession is retrograde: the spin and precession rates have opposite signs (e.g.: a coin) If the body is elongated, the precession is direct: the spin and precession rates have the same signs. (e.g.: an American football). My question is: why does this matter? (I understand why it happens).

2006年2月25日 · This piece of information clears my doubts and explains why the gyroscope makes de precession motion. But why does the body tend to rotate around a line which is a principal axis of maximum moment of inertia?

2005年4月17日 · To have a precession you need to have an external torque. If torque is zero, no precession occur- the angular momentum must be conserved. The visible "precession" could be if the plate has an initial momentum not along its axis of symmetry In that case, the motion in the air can be more complex and unstable because of the turbulence.

2020年2月13日 · Then, I started reading about the precession of Mercury orbit. "Mercury deviates from the precession predicted from these Newtonian effects. This anomalous rate of precession of the perihelion of Mercury's orbit was first recognized in 1859 as a problem in celestial mechanics, by Urbain Le Verrier.

2010年3月27日 · Nowhere do we give it the linear momentum it needs to go around the precession axis. The coriolis force provides just this torque, to push the wheel into the circular motion. While the centripetal force and its moment arm – the radius of the wheel (NOT THE PRECESSION RADIUS) - balances the torque due to gravity.

2019年5月26日 · The spin vector ##\mathbf{S}## is such a quantity. The fact that ##\mathbf{S}## evolves according to Fermi-Walker transport is the source of precession effects in both special and general relativity. Precession in Flat Spacetime. Consider a particle moving in a circular orbit of radius ##r## in the equatorial plane in flat spacetime.

2005年11月28日 · Coordinate precession is apparent precession due to the Earth's own precession. The coordinate system involved uses the Earth's vernal equininox as the reference point. Since this shifts due to the Earth's precession, Mercury would appear to precess relative to this point even if it had no precession of its own.

2023年1月26日 · I just re read the section on precession and it also states that you can ignore the mass of the planet so there was no need for me to include ##M+m##. The prediction using the formula above for the perihelion advance of Mercury actually matches observation which I think is due to the semi major axis being small and a high eccentricity, but for ...