Dynamics of Rotational Motion about a Fixed Axis MCQ

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• A rod is rotating about one end. If a force F1 acting on the other end produces a torque T & supplies power P, find the value of force F2 that will produce the same amount of power when it acts at the midpoint of the rod. Assume that all forces are perpendicular to the axis of rotation & axis of rod. The rod starts from rest.
  ক

  = F1

  খ

  > F1

  গ

  < F1

  ঘ

  No force acting at any other point will produce the same power
• A disc of radius 10cm is rotating about the central axis perpendicular to its plane. A force of 5N acts on it tangentially. The disc was initially at rest. Calculate the value of power supplied by the force when the disc has rotated by 30°.The mass of the disc is 2kg.
  ক

  1.28W

  খ

  1.8W

  গ

  3.9W

  ঘ

  2.63W
• A ring of radius 7cm is rotating about the central axis perpendicular to its plane. A force acts on it, tangentially, such that it does a work of 10J in a complete rotation. Find the value of that force. `
  ক

  0.5/7π N

  খ

  35π N

  গ

  500/7π N

  ঘ

  0.7 N
• A rigid body is rotating about an axis. One force F1 acts on the body such that its vector passes through the axis of rotation. Another force F2 acts on it such that it is perpendicular to the axis of rotation and at a point 5cm from the axis. This force F2 is perpendicular to the radius vector at its point of application. Find the net torque on the body. Let F1 = 10N & F2= 5N.
  ক

  0

  খ

  10.25Nm

  গ

  0.25Nm

  ঘ

  10Nm