Class XI

A mass is revolving in a circle, which is in the plane of paper. The direction of angular acceleration if any, is
  1. towards the radius
  2. upward from the plane of paper
  3. At right angles to the plane of paper.
  4. Tangential
the centre of mass of a system of particles moves
  1. as if all the mass of the system was concentrated at the centre of mass and all the external forces were applied at that point
  2. as if all the mass of the system was concentrated in a sphere around the centre of mass and all the external forces were zero
  3. as if all the mass of the system was concentrated in a sphere around the centre of mass and all the external forces were zero
  4. as if all the mass of the system was concentrated at the centre of mass and all the external forces were zero
The angular velocity of a body changes form 1 rev / sec to 25 rev/sec. without applying any external torque. The ratio of the radii of gyration in the two cases is
  1. it is 1: 25
  2. it is 1: 5
  3. it is 25:1
  4. it is 5:1
The vector product of two vectors a and b is a vector c such that the magnitude of c is given by
  1. |a||b||a||b|tanθ
  2. |a||b||a||b|cosθ
  3. |a||b||a||b|sinθ
  4. |a||b||a||b|cosθ
In an orbital motion, the angular momentum vector is
  1. parallel to the linear momentum
  2. in the orbital plane
  3. along the radius vector
  4. perpendicular to the orbital plane
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