Physics 101 Introduction to Mechanics 

April 19 Angular Momentum II  



Applications
of Conservation of Angular Momentum
A 4.5 m diameter merrygoround 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 merrygoround. What will be the angular velocity
of the merrygoround 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
came from?


About the Course Syllabus Schedule Study Hints Problem Solving Contract BlackBoard Homework assignments & solutions Miscellaneous links About Dr. Jeff Feedback


