Three masses are placed on the x-axis: \(300\) g at the origin, \(500\) g at \(x =40\) cm, and \(400\) g at \(x=70\) cm. The distance of the center of mass from the origin is:

1. \(40\) cm 2. \(45\) cm
3. \(50\) cm 4. \(30\) cm

Subtopic:  Center of Mass |
 82%
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NEET - 2012
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The moment of inertia of a thin uniform rod of 

mass M and length L about an axis passing

through its mid-point and perpendicular to its

length is I0. Its moment of inertia about an 

axis passing through one of its ends and

perpendicular to its length is

(1) I0+ML2/4

(2) I0+2ML2

(3) I0+ML2

(4) I0+ML2/2

Subtopic:  Moment of Inertia |
 80%
From NCERT
NEET - 2011
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A circular disk of moment of inertia It is rotating in a horizontal plane, about its symmetry axis, with a constant angular speed ωi. Another disk of moment of inertia Ib is dropped coaxially onto the rotation disk. Initially the second disk has zero angular speed. Eventually both the disks rotate with a constant angular speed ωf. The energy lost by the initially rotating disc to friction is 

(1)12Ib2It+Ibωi2                                     

(2)12It2It+Ibωi2

(3)12Ib-ItIt+Ibωi2                                     

(4)12IbItIt+Ibωi2

Subtopic:  Angular Momentum |
 68%
From NCERT
NEET - 2010
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A man of 50 kg mass is standing in a gravity free space at a height of 10m above the floor. He throws a stone of 0.5 kg mass downwards with a speed 2 ms-1. When the stone reaches the floor, the distance of the man above the floor will be 

1. 9.9m                                 

2. 10.1m

3. 10m                                 

4. 20m                       

Subtopic:  Center of Mass |
 75%
From NCERT
NEET - 2010
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From a circular disc of radius R and mass 9M, a small disc of mass M and radius R3 is removed concentrically. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through its centre is:

(a) 409MR2                                        (b) MR2

(c) 4 MR2                                           (d) 49MR2

Subtopic:  Moment of Inertia |
 68%
From NCERT
NEET - 2010
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If F is the force acting on a particle having position vector r and τ be the torque of this force about the origin, then 

(a) r.τ0 and F.τ=0                  

(b) r.τ>0 and F.τ<0

(c) r.τ=0 and F.τ=0

(d) r.τ=0 and F.τ0

Subtopic:  Torque |
 79%
From NCERT
NEET - 2009
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Two bodies of mass 1kg and 3kg have position vectors i^+2j^+k^ and -3i^-2j^+k^, respectively. The centre of mass of this system has a position vector -

(1) -2i^+2k^

(2) -2i^-j^+k^

(3) 2i^-j^-2k^

(4) -i^+j^+k^

Subtopic:  Center of Mass |
 85%
From NCERT
NEET - 2009
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Four identical thin rods each of mass M and length t, form a square frame. Moment of inertia of this frame about an axis through the centre of the square and perpendicular to its plane is 

(1) 43Mt2                                   

(2) 23Mt2

(3) 133Mt2                                 

(4) 13Mt2

Subtopic:  Moment of Inertia |
 70%
From NCERT
NEET - 2009
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A thin rod of length L and mass M is bent at its midpoint into two halves so that the angle between them is 90°. The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the plane defined by the two halves of the rod is 

(a) ML224

(b) ML212

(c) ML26

(d) 2ML224

Subtopic:  Moment of Inertia |
 66%
From NCERT
NEET - 2008
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The moment of inertia of a uniform circular disc is maximum about an axis perpendicular to the disc and passing through:
 
1. B                   
2. C
3. D                   
4. A

Subtopic:  Moment of Inertia |
 78%
From NCERT
NEET - 2012
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