A ball of mass m falls vertically to the ground from a height h1 and rebound to a height h2. The change in momentum of the ball on striking the ground is 

(1) mg(h1h2)

(2) m2gh1+2gh2

(3) m2g(h1+h2)

(4) m2g(h1+h2)

Subtopic:  Application of Laws |
 74%
From NCERT
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Consider the following two statements

1. Linear momentum of a system of particles is zero

2. Kinetic energy of a system of particles is zero Then 

(1) 1 implies 2 and 2 implies 1

(2) 1 does not imply 2 and 2 does not imply 1

(3) 1 implies 2 but 2 does not imply 1

(4) 1 does not imply 2 but 2 implies 1

Subtopic:  Newton's Laws |
From NCERT
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An elevator and its load have a total mass of 800 kg .Find the tension in the supporting cable when the elevator, moving downward at 10 m/s is brought to rest with constant acceleration in a distance of 25 m. ( Take g = 10m/s2 ) :-

(1) 6400 N

(2) 8000 N

(3) 9600 N

(4) Zero

Subtopic:  Application of Laws |
From NCERT
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Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole system is is suspended by a massless spring as shown in figure. the magnitudes of acceleration of A and B immediately after the string is cut, are respectively

1. g, g/3

2. g/3, g

3. g, g

4. g/3, g/3

 

 

Subtopic:  Spring Force |
 70%
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A car is negociating a curved road of radius R. The road is banked at angle θ. The coefficient of friction between the car and the road is μs. The maximum safe velocity on this road is 

(a)gRtanθ+μs1μstanθ 

(b) gRtanθ+μs1μstanθ

(c) gR2tanθ+μs1μstanθ

(d) gR2tanθ+μs1μstanθ

Subtopic:  Banking of Roads |
 83%
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The length of a spring is l1 and l2, when stretched with a force of 4 N and 5 N respectively. Its natural length is

1. l2 + l1

2. 2(l2-l1)

3. 5l1 - 4l2

4. 5l2 - 4l1

Subtopic:  Spring Force |
 77%
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Two stones of masses m and 2m are whirled in horizontal circles, the heavier one in a radius r2 and the lighter one in the radius r. The tangential speed of lighter stone is n times that of heavier stone when they experience the same centripetal forces. The value of n is:

1. 2 2. 3
3. 4 4.
Subtopic:  Uniform Circular Motion |
 67%
From NCERT
NEET - 2015
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One end of the string of length l is connected to a particle of mass m and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in a circle with speed v, the net force on the particle (directed towards the centre) will be: (T represents the tension in the string)

1. \(T \) 2. \(T+\frac{m v^2}{l} \)
3. \(\mathrm{T}-\frac{m v^2}{l} \) 4. \(\text{Zero}\)
Subtopic:  Uniform Circular Motion |
 53%
From NCERT
NEET - 2017
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A spring of force constant k is cut into lengths of ratio 1:2:3. They are connected in series and the new force constant is k'. If they are connected in parallel and force constant is k'', then k':k'' is 

(1) 1:6

(2) 1:9

(3) 1:11

(4) 6:11

Subtopic:  Spring Force |
 72%
From NCERT
NEET - 2017
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Three blocks A, B and C of masses 4 kg, 2 kg and 1 kg respectively, are in contact on a frictionless surface, as shown. If a force of 14 N is applied on the 4 kg block, then the contact force between A and B is


1.2N

2. 6N

3. 8N

4. 18N

Subtopic:  Application of Laws |
 80%
From NCERT
NEET - 2015
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