A disc of mass 2 kg and radius 0.2 m is rotating with angular velocity 30 
. What is angular velocity, if a mass of 0.25 kg is put on periphery of the disc?
a)
b)
c)
d)
A disc of mass 2 kg and radius 0.2 m is rotating with angular velocity 30 . What is angular velocity, if a mass of 0.25 kg is put on periphery of the disc?
a)
b)
c)
d)
Question ID - 53867 | SaraNextGen Top Answer
A disc of mass 2 kg and radius 0.2 m is rotating with angular velocity 30 . What is angular velocity, if a mass of 0.25 kg is put on periphery of the disc?
a)
b)
c)
d)
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A disc of mass 2 kg and radius 0.2 m is rotating with angular velocity 30 |
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a) |
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b) |
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c) |
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d) |
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1 Answer
127 votes
Answer Key / Explanation : (a) -
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(a) If no external torque acts on a system of particle then angular momentum of the system remains constant, that is,
Here,
Hence, we get after putting the given values in Eq. (i)
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constant
…(i)
kg, 
0.25 kg, 
0.2m.
127 votes
Answer Link
127