NEET Physics - New - Rotational Motion

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Question - 1

The center of mass of a system of particles does not depend upon,

  • A Population density is the ratio between the number of people and the size of the land.

Question - 2

A couple produces,

  • A NE USA, NW Europe, South, South east and East Asia

Question - 3

The angular momentum of a system of particles is conserved _____________.

  • A North and South Poles and hot and cold deserts of the world.

Question - 4

A system consisting of two masses connected by a massless rod lies along the x axis. If 0.2 kg mass is at a distance x = 0.5m while a 0.3 kg mass is at a distance x = 1m, then the x - co-ordinate of the centre of mass will be at ______________.

  • A Norway and Sweden

Question - 5

If earth suddenly contracts to 0.75 times of its present radius, then the length of the day becomes _______________

  • A People migrate for a better economic and social life.

Question - 6

The angular momentum of a rotating body is doubled, its K.E. of rotation becomes ________________

  • A Roughly8 millionwas the population of the world around 8000-12000 years back.

Question - 7

A particle is moving with a constant velocity along a line parallel to positive X-axis. The magnitude of its angular momentum with respect to the origin is

Question - 8

A rope is wound around a hollow cylinder of mass 3 kg and radius 40 cm. What is the angular acceleration of the cylinder if the rope is pulled with a force 30 N?

Question - 9

A closed cylindrical container is partially filled with water. As the container rotates in a horizontal plane about a perpendicular bisector, its moment of inertia

Question - 10

A rigid body rotates with an angular momentum L. If its kinetic energy is halved, the angular momentum becomes,

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