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 Apr 20 revised What is the minimal G-force curve in 2-dimensional space? added 1787 characters in body Apr 20 answered What is the minimal G-force curve in 2-dimensional space? Apr 20 comment What is the minimal G-force curve in 2-dimensional space? Possible duplicate of non-accepted answer physics.stackexchange.com/a/185261/392 Apr 20 answered Rotation of rigid body with two different angular velocities Apr 20 comment Rotation of rigid body with two different angular velocities Is $\omega$ the joint velocity (relative) or the absolute velocity of the cylinder? Apr 19 answered Principal axis of inertia parallel to the ones passing through the center of mass Apr 19 comment Principal axis of inertia parallel to the ones passing through the center of mass No principal axes of inertia only go through the center of mass. Apr 19 comment The two causes for the factor 2 in Coriolis effect I thought about it, and i decided if I list a component by component answer it would be clear. It ain't, so then I added the picture after the fact. Apr 19 comment Forces that exert torque on a rigid body in rotation when angular momentum is not parallel to angular velocity Also, I fixed a few typos in the equations above. Apr 19 revised Forces that exert torque on a rigid body in rotation when angular momentum is not parallel to angular velocity edited body Apr 19 comment Forces that exert torque on a rigid body in rotation when angular momentum is not parallel to angular velocity It came from $I \vec{\alpha} + \vec{\omega} \times I \vec{\omega}$ which is zero for a constant rotation with a point mass. At each center of mass, the mass moment of inertia is zero. Even if you give the masses a radius $r$, due to symmetry this would be zero. Apr 19 revised Forces that exert torque on a rigid body in rotation when angular momentum is not parallel to angular velocity edited body Apr 18 comment Remove salt from dirt I'm voting to close this question as off-topic because it belongs to Chemistry Apr 18 answered Forces that exert torque on a rigid body in rotation when angular momentum is not parallel to angular velocity Apr 18 comment Forces that exert torque on a rigid body in rotation when angular momentum is not parallel to angular velocity The weight does not apply a moment on the center of mass, but it affects the support which does apply a moment on the center of mass. Thus a top will not precess at microgravity. Apr 17 comment Why does the magnitude of linear momentum of a particle in circular motion change with radius? This has been answered here many times. Links anyone? Apr 15 comment Assuming there is no wind, do two raindrops of different sizes fall at the same speed? @WhatRoughBeast I have seen too photos of droplets and they look like disks actually. Apr 15 revised Why is the center of mass frame always used in rigid body dynamics? added 628 characters in body Apr 15 answered Why is the center of mass frame always used in rigid body dynamics? Apr 15 comment Assuming there is no wind, do two raindrops of different sizes fall at the same speed? Two drops of the same mass at different speeds have different $C_d$ but similar area $A$. Two drops of different mass at the same speed may have similar $C_d$ but will have different area $A$.