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    Physics
    Mechanics
    Easy

    Question

    When a steady torque (net force is zero) is acting on a body, the body

    1. text  rotates at a constant speed  end text
    2. text  gets both linear and angular acceleration  end text
    3. text  gets no angular acceleration  end text
    4. c e n t r e space o f space t h e space b o d y space c o n t i n u e s space i n space i t s space s t a t e space o f space r e s t space o r space u n i f o r m space m o t i o n space a l o n g space a space s t r a i g h t space l i n e

    The correct answer is: c e n t r e space o f space t h e space b o d y space c o n t i n u e s space i n space i t s space s t a t e space o f space r e s t space o r space u n i f o r m space m o t i o n space a l o n g space a space s t r a i g h t space l i n e

      S i n c e space n e t space f o r c e space i s space z e r o comma space s o space a with rightwards harpoon with barb upwards on top subscript c m end subscript equals 0

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      W h e n space a space t o r q u e space a c t i n g space u p o n space a space s y s t e m space i s space z e r o comma space w h i c h space o f space t h e space f o l l o w i n g space w i l l space b e space c o n s tan t ?

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      text  A couple produces  end text

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      text  A moving body with a mass m end text subscript 1 text   strikes a body of mass  end text m subscript 2 text  which is stationary.  end text text  Assuming perfectly elastic impact, the ratio  end text m subscript 1 divided by m subscript 2 text  so as to decrease the velocity of  end text text  first body  end text 1.5 text  times is  end text

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