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Concepts Of Physics MCQ Edition [Volume 1]PhysicsRotational Mechanics

A string is wrapped on a wheel of moment of inertia 0.20 kg-m ^2 and radius 10 cm and goes through a pulley to support a block of mass 2.0 kg as shown in the figure. The smaller pulley has radius 5.0 cm and moment of inertia 0.10 kg-m ^2 . Find the tension in the part of the string joining the pulleys.

Options

  1. A6.3 N
  2. B4.2 N
  3. C8.4 N
  4. D12.6 N

Correct answer

A. 6.3 N

Step-by-step solution

Write equations for the block and use = I for the two pulleys with = a/r . Solving the coupled equations gives the string tension between the pulleys as 6.3 N .

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