A mass of 100g strikes the wall with speed 5m/s at an angle as shown in figure and it rebounds with the same speed. If the contact time is 2×103sec, what is the force applied on the mass by the wall 

(1) 2503N to right

(2) 250 N to right

(3) 2503N to left

(4) 250 N to left

Subtopic:  Application of Laws |
 67%
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A lead ball strikes a wall and falls down, a tennis ball having the same mass and velocity strikes the wall and bounces back. Check the correct statement

(1) The momentum of the lead ball is greater than that of the tennis ball

(2) The lead ball suffers a greater change in momentum compared with the tennis ball

(3) The tennis ball suffers a greater change in momentum as compared with the lead ball

(4) Both suffer an equal change in momentum

Subtopic:  Application of Laws |
 69%
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A ball of weight 0.1 kg coming with speed 30 m/s strikes with a bat and returns in opposite direction with speed 40 m/s, then the impulse is (Taking final velocity as positive) 

(1) 0.1×(40)0.1×(30)

(2) 0.1×(40)0.1×(30)

(3) 0.1×(40)+0.1×(30)

(4) 0.1×(40)0.1×(20)

Subtopic:  Application of Laws |
 66%
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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%
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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 |
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A force-time graph for a linear motion is shown in figure where the segments are circular. The linear momentum gained between zero and 8 second is 

1. 2πnewton×second

2. Zeronewton×second

3. +4πnewton×second

4. 6πnewton×second

Subtopic:  Newton's Laws |
 82%
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A particle of mass m moving with a velocity u makes an elastic one dimensional collision with a stationary particle of mass m establishing a contact with it for extremely small time T. Their force of contact increases from zero to F0 linearly in time T4, remains constant for a further time T2 and decreases linearly from F0 to zero in further time T4 as shown. The magnitude possessed by F0 is

(1) muT

(2) 2muT

(2) 4mu3T

(4) 3mu4T

Subtopic:  Newton's Laws |
 63%
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Two blocks A and B of masses 3m and m respectively are connected by a massless and inextenisible string. The whole system 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,g3

2. g3,g

3. g,g

4. g3,g3

 

Subtopic:  Spring Force |
 68%
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NEET - 2017
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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. \(T-\frac{m v^2}{l} \) 4. \(\text{zero}\)
Subtopic:  Uniform Circular Motion |
 54%
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NEET - 2017
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A rigid ball of mass m strikes a rigid wall at 60° and gets reflected without loss of speed as shown in the figure. The value of impulse imparted by the wall on the ball will be 

(1) mv

(2) 2mv

(3) mv/2

(4) mv/3

Subtopic:  Newton's Laws |
 71%
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NEET - 2016
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