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Worksheet-3



                                         Sub-topic-Rotational KE



               1    A couple is acting on a two particle system. The resultant motion will be
                    a. purely rotational motion
                    b. purely linear motion
                    c. both ( a )and( b)
                    c. neither ( a )and( b)
               2    Angular momentum is
                    a. moment of momentum
                    b. Product of mass and angular velocity
                    c. Product of MI and velocity
                    d. moment of angular momentum

               3    If a person standing on a rotating disc stretches out his hands , the angular speed will
                    a. increases
                    b. decreases
                    c. remain same
                    d. none of these
               4    A disc is rolling on the inclined plane. What is the ratio of its rotational KE to total KE
                    a.1:2
                    b. 3:1
                    c. 1:3
                    d. 2:1
               5    A coin of mass 4.8 kg and radius 1m is rolling on a horizontal surface without sliding with angular
                    velocity 600 rotations /min. What is the total KE of the coin?
                    a.360J
                           2
                    b.1440 J
                            2
                    c. 4000 J
                           2
                    d. 600 J
               6    A disc is rotating with an angular speed  .If a child sits on it, what is conserved
                    a. linear momentum
                    b. angular momentum
                    c. KE
                    d. PE
               7    An automobile engine develops  100kW when rotating at a speed of 1800rev/min.What torque
                    does it deliver?
                    a.  350N
                    b.  531N
                    c.  440N
                    d.  628N
               8    A flywheel is attached to an engine
                    a.  increase its speed
                    b.  decrease its speed
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