3 votes
Accepted

Relationship between how fast a metal cylinder can spin on its axis without breaking or deforming?

For a thin spinning disk ignoring the frictions, such as air friction, there are two stresses, radial and hoop stress. Both must be below the accepted stress limit of the material. We assume no ...
kamran's user avatar
  • 22.2k
3 votes

Why can’t we accelerate a rotating object after some point?

This gets back to the original answer by Tigerguy. You have the maximum torque your legs can put out. You also have the maximum power your legs can put out (power = torque x rotational speed). But you ...
PatMc's user avatar
  • 109
2 votes

Why can’t we accelerate a rotating object after some point?

This would work if input power could handle infinite speeds. On a bicycle, your legs limit how fast you can pedal and the power you can input to the system. Motors have speed limits as well. The ...
Tiger Guy's user avatar
  • 6,813
1 vote

Friction force between two wheels at constant rpm

which would result in the piece of paper experiencing a force with magnitude of 2Ff in the opposite direciton of 2Ff. It doesn't. I remember having this confusion too. Remember about internal ...
DKNguyen's user avatar
  • 5,556
1 vote
Accepted

How to compute the torques of a network of rotating objects with cycles?

This isn't really an answer, sorry in advance. Not sure the exact language to use, but it seems to me that a cyclic network of rigid connections would be is overconstrained in some sense, and so I don'...
Pete W's user avatar
  • 1,541

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