Scelta multipla
A small object (red, m) is on a smooth table top and attached to a light string that runs through a hole in the table. The other end of the string attaches to a hanging weight (green, M). When the small object is given some speed, it spins in a circular path around the hole, with the tension from the hanging weight providing the centripetal force that keeps it spinning. If the object spins with angular speed ω when it is a distance R from the central hole, what new angular speed (in terms of ω) does it have when this distance is halved?
BONUS: What new mass does the hanging weight need, in terms of M, to support a circular path at the new speed?
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