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A small mass attached to a string rotates on frictionless table top as shown. If the tension in the string is increased by pulling the string causing the radius of the cutcular motion to decrease by a factor of 2, the kinetic eneegy of the mass will

  • Option 1)

    remain constant

  • Option 2)

    increase by a factor of 2

  • Option 3)

    increase by a factor of 4

  • Option 4)

    decrease by a factor of 2

 
As discussed in Angular momentum - - wherein   represent angular momentum of a moving particle about a point. it can be calculated  as = Length of perpendicular on line of motion = component of momentum along perpendicualar to   is increased by a factor of 4  Option 1) remain constant This option is incorrect. Option 2) increase by a factor of 2 This option is incorrect. Option...
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