Eamcet - Physics - Rotatory Motion

Identify the increasing order of the angular velocities of the following :1.earth rotating about its own axis2.hour's hand of a clock3.second's hand of a clock4.flywheel of radius 2 m making 300 rpm

A.  1,2,3,4

B.  2,3,4,1

C.  3,4,1,2

D.  4,1,2,3

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Correct Answer :

1,2,3,4



Explanation :
No Explanation available for this question

Two particles P and Q are located at distance rp and rq respectively from the centre of a rotating disc such that rp > rq

A.  Both P and Q have the same acceleration

B.  Both P and Q do not have any acceleration

C.  P has greater acceleration than Q

D.  Q has greater acceleration than P

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Correct Answer :

P has greater acceleration than Q



Explanation :
No Explanation available for this question

Two solid spheres (A and B) are made of metals of different densities and ρA  and ρB  respectively. If their masses are equal, the ratio of their moments of inertia {IB/IA) about their respective diameter is

A.  (ρB /ρA )2/3

B.  (ρA /ρB )2/3

C.  (ρA /ρB )

D.  (ρB /ρA )

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Correct Answer :

(&#961;<sub>B</sub> /&#961;<sub>A )<sup>2/3</sup><br></sub>



Explanation :
No Explanation available for this question

A uniform rod of length 8a and mass 6m lies on a smooth horizontal surface. Two point masses m and 2m moving in the same plane with speed 2 v and v repectively strike the rod perpendicularly at distances a and 2a from the mid point of the rod in the opposite directions and stick to the rod. The angular velocity of the system immediately after the collision is:

A.  6v/32a

B.  6v/33a

C.  6v/40a

D.  6v/41a

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Correct Answer :

6v/41a



Explanation :
No Explanation available for this question

A thin metal disc of radius 0.25 m and mass 2 kg starts from rest and rolls down an Inclined plane. If its rotational kinetic energy is 4 J at the foot of the inclined plane, then its linear velocity at the same point is:

A.  1.2 m/s

B.  2√2 m/s

C.  20 m/s

D.  2 m/s

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Correct Answer :

2&#8730;2 m/s



Explanation :
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A wheel has a speed of 1200 revolution per minute and is made to slow down at a rate of 4 radian/sec2. The number of revolutions it makes before coming to rest is :

A.  143

B.  272

C.  314

D.  722

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Correct Answer :

314



Explanation :
No Explanation available for this question