A uniform disk, a thin hoop, 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 momenta after a given time t, least to greatest.
A) all tie
B) disk, hoop, sphere
C) hoop, disk, sphere
D) hoop, sphere, disk

Question

A uniform disk, a thin hoop, 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 momenta after a given time t, least to greatest. 
A) all tie 
B) disk, hoop, sphere 
C) hoop, disk, sphere 
D) hoop, sphere, disk

Quizplus · Accepted Answer

The Answer of A uniform disk, a thin hoop, 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 momenta after a given time t, least to greatest. 
A) all tie 
B) disk, hoop, sphere 
C) hoop, disk, sphere 
D) hoop, sphere, disk

A Uniform Disk, a Thin Hoop, and a Uniform Sphere