Engineering
Physics
Magnet and Magnetic Dipole Moment
Question

A uniform disk, a thin hoop (ring), and a uniform sphere, all with the same mass and same outer radius, are each free to rotate about a fixed axis through its center. Assume the hoop is connected to the rotation axis by light spokes. With the objects starting from rest, identical forces are simultaneously applied to the rims, as shown. Rank the objects according to their angular momentum after a given time t, least to greatest.

disk, hoop, sphere

hoop, sphere, disk

hoop, disk, sphere

all tie

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Solution
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ΔL=JR=Ldt=Lt
Same for all

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