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Two discs are rotating about their axes, normal to the discs and passing through the centres of the discs. Disc D1 has 2 kg mass and 0.2 m radius and initial angular velocity of  50 rad s–1. Disc D2 has 4kg mass, 0.1 m radius and initial angular velocity of 200 rad s–1. The two discs are brought in contact face to face, with their axes of rotation coincident. The final angular velocity (in rad s–1) of the system is [NEET Kar. 2013]
  • a)
    40
  • b)
    60
  • c)
    100
  • d)
    120
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Two discs are rotating about their axes, normal to the discs and passi...
Given: m1 = 2 kg m2 = 4 kg
r1 = 0.2 m r2 = 0.1 m
w1 = 50 rad s–1 w2 = 200 rad s–1
As,   I1W1 = I2W2 = Constant
By putting the value of m1, m2, r1, r2 and solving we get = 100 rad s–1
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Two discs are rotating about their axes, normal to the discs and passi...
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Two discs are rotating about their axes, normal to the discs and passing through the centres of the discs. Disc D1 has 2 kg mass and 0.2 m radius and initial angular velocity of 50 rad s–1. Disc D2 has 4kg mass, 0.1 m radius and initial angular velocity of 200 rad s–1. The two discs are brought in contact face to face, with their axes of rotation coincident. The final angular velocity (in rad s–1) of the system is [NEET Kar. 2013]a)40b)60c)100d)120Correct answer is option 'C'. Can you explain this answer?
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