A body of mass M hits normally a rigid wall with velocity v and bounces back with the same velocity. The impulse experienced by the body is

(1) 1.5 Mv                                                 

(2) 2 Mv

(3) zero                                                     

(4) Mv

Subtopic:  Newton's Laws |
 84%
From NCERT
NEET - 2011
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A gramophone record is revolving with an angular velocity ω. A coin is placed at a distance r from the centre of the record. The static coefficient of friction is μ. The coin will revolve with the record if: 

1. r=μgω2                                       2. r<ω2μg

3. rμgω2                                         4. rμgω2

Subtopic:  Uniform Circular Motion |
 66%
From NCERT
NEET - 2010
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The mass of a lift is 2000 kg. When the tension in the supporting cable is 28000 N, its acceleration is:

1. 30 ms-2 downwards                                      
2. 4 ms-2 upwards
3. 4 ms-2 downwards                                        
4. 14 ms-2 upwards

Subtopic:  Application of Laws |
 78%
From NCERT
NEET - 2009
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Three forces acting on a body are shown in the figure. To have the resultant force only along the y-direction, the magnitude of the minimum additional force needed is 

1. 0.5N

2. 1.5N

3. 34 N

4. 3N

Subtopic:  Application of Laws |
 56%
From NCERT
NEET - 2008
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A particle of mass m is projected with velocity v making an angle of 45° with the horizontal. When the particle lands on the level ground the magnitude of the change in its momentum will be 

1.  2mv

2. mv/2

3. mv2

4. zero 

 

Subtopic:  Newton's Laws |
 59%
From NCERT
NEET - 2008
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Sand is being dropped on a conveyor belt at the rate of \(M~\text{kg/s}\). The force necessary to keep the belt moving with a constant velocity of \(v~\text{m/s}\) will be:
1. \(Mv~\text{N}\)
2. \(2Mv~\text{N}\)
3. \(\frac{Mv}{2}~\text{N}\)
4. zero

Subtopic:  Variable Mass System |
 69%
From NCERT
NEET - 2008
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A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration 1.0 m/s2. If g=10 m/s2, the tension in the supporting cable is:

1. 9680 N

2. 11000 N

3. 1200 N

4. 8600 N

Subtopic:  Application of Laws |
 89%
From NCERT
NEET - 2011
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A car of mass \(m\) is moving on a level circular track of radius \(R\). If \(\mu_s\) represent the static friction between the road and tyres of the car, then the maximum speed of the car in circular motion is given by:

1. \(\sqrt{\mu_{s} mRg} \) 2. \(\sqrt{Rg / \mu_{s}}\)
3. \(\sqrt{mRg / \mu_{s}} \) 4. \(\sqrt{\mu_{s} {Rg}}\)
Subtopic:  Uniform Circular Motion |
 88%
From NCERT
NEET - 2012
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A balloon with mass m is descending down with an acceleration a (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration a?

1. 2ma/g+a

2. 2ma/g-a

3. ma/g+a

4. ma/g-a

Subtopic:  Application of Laws |
 61%
From NCERT
NEET - 2014
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Two stones of masses m and 2m are whirled in horizontal circles, the heavier one in a radius r/2 and the lighter one in radius r. The tangential speed of lighter stone is n times that of the value of heavier stone when they experience same centripetal forces. The value of n is

1. 2

2. 3

3. 4

4. 1

Subtopic:  Uniform Circular Motion |
 70%
From NCERT
NEET - 2015
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