oh shoot! I forgot that the mass doubles as well as the radius. Yes, I was overcomplicating things by using kinematics rather than using conservation of energy...
But the thing that was messing me up was not doubling the mass as well as the radius.
Homework Statement
A uniform circular ring of radius R is fixed in place. A particle is placed on the axis of the ring
at a distance much greater than R and allowed to fall towards the ring under the influence of the ring’s gravity. The particle achieves a maximum speed v. The ring is...
Homework Statement
Two skaters on a frictionless pond push apart from one another. One skater has mass M much greater than the mass m of the second skater. After some time the two skaters are a distance d apart. How far has the lighter moved from original position.
The answer is somehow...