Physics 101- Introduction to Mechanics
|April 19- Angular Momentum II|
of Conservation of Angular Momentum
A 4.5 m diameter merry-go-round of mass
170 kg is rotating freely with an angular velocity of 0.70 rad/ sec.
Four people standing on the ground, each of mass 65 kg, suddenly step onto
the edge of the merry-go-round. What will be the angular velocity
of the merry-go-round now?
Two astronauts of roughly equal mass are floating in space. They both hold onto a light rod 20m long and the whole system is rotating about the center of the rod about once every 30s. What is the ordinary (linear) speed of each astronaut?
Now imagine that the astronauts pull themselves
along the rod until they are 10m apart. What is their ordinary (linear)
speed now? Where do you think that their increased kinetic energy
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