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Two discs of moments of inertia I1 and I2 about their respective axes (normal to the disc and passing through the centre), and rotating with angular speeds I1 and I2 are brought into contact face to face with their axes of rotation coincident. What is the angular speed of the two disc system?
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Two discs of moments of inertia I1 and I2 about their respective axes ...
As there is no any external force acting between the two discs so according to law of conservation of angular momentum, we get
L= Iω
So, I1ω1 + I2ω2 = (I1 + I2) ω
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Most Upvoted Answer
Two discs of moments of inertia I1 and I2 about their respective axes ...
As there is no any external force acting between the two discs so according to law of conservation of angular momentum L=Iw now equate both conditions given u will get the answer c
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Community Answer
Two discs of moments of inertia I1 and I2 about their respective axes ...
As there is no any external force acting between the two discs so according to law of conservation of angular momentum, we get
L= Iω
So, I1ω1 + I2ω2 = (I1 + I2) ω
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Two discs of moments of inertia I1 and I2 about their respective axes (normal to the disc and passing through the centre), and rotating with angular speeds I1 and I2 are brought into contact face to face with their axes of rotation coincident. What is the angular speed of the two disc system?a)b)c)d)Correct answer is option 'C'. Can you explain this answer?
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