Exam-style question
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If a solid disk and a hollow cylinder have the same mass and radius, which has a greater moment of inertia?.
- A.The solid disk
- B.The hollow cylinder
- C.They have the same moment of inertia
- D.It cannot be determined
Model answer
What a good answer should say
- The hollow cylinder
Explanation
Why this works
The hollow cylinder has a greater moment of inertia than the solid disk because more of its mass is located further from the axis of rotation. This results in a larger moment of inertia, making it harder to rotate compared to the solid disk.
Common mistake
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