Ex9 We rotate a small mass m = 15g attached to the end of a wire of length L1 = 75cm (and of negligible mass). The wire wraps around a vertical rod as the mass rotates. The small mass rotates in a horizontal plane. If the speed of mass and v1 = 5 m/s, calculate its speed when the string measures only 15cm. Is there conservation of kinetic energy? Justify your answer. My questions are: (1) In your answer, you are using I-mR2, why is Inertia not 1/12mR²? (2) The small object attached the wire, why we do not use Parallel Axis Theorem? (3) Can you please kindly draw the picture that I can understand?

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Chapter1: Units, Trigonometry. And Vectors
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Ex9
We rotate a small mass m = 15g attached to the end of a wire of length L1 = 75cm (and of
negligible mass). The wire wraps around a vertical rod as the mass rotates. The small mass
rotates in a horizontal plane. If the speed of mass and v1 = 5 m/s, calculate its speed when the
string measures only 15cm. Is there conservation of kinetic energy? Justify your answer.
My questions are:
(1) In your answer, you are using I-mR2, why is Inertia not 1/12mR²?
(2) The small object attached the wire, why we do not use Parallel Axis Theorem?
(3) Can you please kindly draw the picture that I can understand?
Transcribed Image Text:Ex9 We rotate a small mass m = 15g attached to the end of a wire of length L1 = 75cm (and of negligible mass). The wire wraps around a vertical rod as the mass rotates. The small mass rotates in a horizontal plane. If the speed of mass and v1 = 5 m/s, calculate its speed when the string measures only 15cm. Is there conservation of kinetic energy? Justify your answer. My questions are: (1) In your answer, you are using I-mR2, why is Inertia not 1/12mR²? (2) The small object attached the wire, why we do not use Parallel Axis Theorem? (3) Can you please kindly draw the picture that I can understand?
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