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 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 conveyor belt is moving at a constant speed of 2 m/s. A box is gently dropped on it. The coefficient of friction between them is μ=0.5. The distance that the box will move relative to the belt before coming to rest on it taking g=10 ms-2, is 

1. 1.2 m                                            2. 0.6 m

3. zero                                               4. 0.4 m

Subtopic:  Friction |
 71%
From NCERT
NEET - 2011
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A block of mass m is in contact with the cart C as shown in the figure.

The coefficient of static friction between the block and the cart is μ.The acceleration α of the cart that will prevent the block from falling satisfies

1. α>mgμ                                       2. α>gμm

3. αgμ                                          4. α<gμ

Subtopic:  Pseudo Force |
 78%
NEET - 2010
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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:

(a) 30 ms-2 downwards                                       (b) 4 ms-2 upwards

(c) 4 ms-2 downwards                                         (d) 14 ms-2 upwards

Subtopic:  Application of Laws |
 78%
From NCERT
NEET - 2009
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A body, under the action of a force F=6i^-8j^+10k^, acquires an acceleration of 1ms-2. The mass of this body must be

(1) 2010kg                                   

(2) 10kg

(3) 20kg                                         

(4) 102kg                                

Subtopic:  Newton's Laws |
 89%
From NCERT
NEET - 2009
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A roller coaster is designed such that riders experience "weightlessness" as they go round the top of a hill whose radius of curvature is 20m. The speed of the car at the top of the hill is between:

1. 14m/s and 15m/s

2. 15m/s and 16m/s

3. 16m/s and 17m/s

4. 13m/s and 14m/s

Subtopic:  Non Uniform Vertical Circular Motion |
 77%
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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