Q. No.A batsman hits back a ball of mass \(0.4\text{ kg}\) straight in the direction of the bowler without changing its initial speed of \(15\text{ m/s}.\) The impulse imparted to the ball is:
1. \(10\text{ Ns}\)
2. \(11\text{ Ns}\)
3. \(12\text{ Ns}\)
4. \(13\text{ Ns}\)
1. \(10\text{ Ns}\)
2. \(11\text{ Ns}\)
3. \(12\text{ Ns}\)
4. \(13\text{ Ns}\)
Subtopic: Newton's Laws |
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A balloon has a mass of \(10\text{ g}\) in the air. The air escapes from the balloon at a uniform rate with a velocity of \(4.5\text{ cm/s}.\) If the balloon shrinks in \(5\text{ s}\) completely. Then, the average force acting on that balloon will be (in dyne).
1. \(3\)
2. \(9\)
3. \(12\)
4. \(18\)
1. \(3\)
2. \(9\)
3. \(12\)
4. \(18\)
Subtopic: Newton's Laws |
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A player caught a cricket ball of mass \(\mathrm{150 ~g}\) moving at a speed of \(20 \mathrm{~m} / \mathrm{s}.\) If the catching process is completed in \(\mathrm{0.1 ~s ,}\) the magnitude of force exerted by the ball on the hand of the player is:
1. \(\mathrm{150 ~N}\)
2. \(\mathrm{3 ~N}\)
3. \(\mathrm{30~N}\)
4. \(\mathrm{300~N}\)
1. \(\mathrm{150 ~N}\)
2. \(\mathrm{3 ~N}\)
3. \(\mathrm{30~N}\)
4. \(\mathrm{300~N}\)
Subtopic: Newton's Laws |
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A bullet of mass \(10\) g is fired from a gun (mass of \(10\) kg without a bullet) with a speed of \(100\) m/s. The recoil speed of the gun is:
| 1. | \(\dfrac{1}{10}\) m/s | 2. | \(\dfrac{1}{5}\) m/s |
| 3. | \(\dfrac{5}{2}\) m/s | 4. | \(\dfrac{2}{5}\) m/s |
Subtopic: Newton's Laws |
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If a body of mass \(5 ~\text {kg}\) is in equilibrium due to forces \(F_1, F_2\) and \(F_3 . F_2\) and \(F_3\) are perpendicular to each other. If \(F_1\) is removed, then the acceleration of the body is: (given: \(F_2 = 6~\text N\) and \(F_3 = 8~\text N\))
1. \(2~\text{ m/s}^2\)
2. \(3~\text{ m/s}^2\)
3. \(4~\text{m/s}^2\)
4. \(5~ \text{m/s}^2\)
1. \(2~\text{ m/s}^2\)
2. \(3~\text{ m/s}^2\)
3. \(4~\text{m/s}^2\)
4. \(5~ \text{m/s}^2\)
Subtopic: Newton's Laws |
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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. \(1.5Mv\)
2. \(2Mv\)
3. zero
4. \(Mv\)
Subtopic: Newton's Laws |
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AIPMT - 2011
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A person reports that a particle has a non-zero acceleration even though no force is acting on it. Which of the following could explain this observation?
| 1. | The person is lying. |
| 2. | The person’s clock might be running slow. |
| 3. | The person’s metre scale might be longer than the standard scale. |
| 4. | The observation might have been made from a non-inertial frame of reference. |
Subtopic: Newton's Laws |
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A machine gun is firing \(10~ \text{g}\) bullets with a speed of \(250~\text{m/s}.\) To keep the machine gun in its position, \(125 ~\text{N}\) force is required. The number of bullets fired per second are:
| 1. | \(40\) | 2. | \(50\) |
| 3. | \(25\) | 4. | \(10\) |
Subtopic: Newton's Laws |
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A tennis ball of mass \(m\) strikes a racquet and rebounds with the same speed \(v\) as before impact. The ball approaches and leaves the racquet, making an angle \(\theta\) with the normal to the racquet’s surface, as shown in the figure. What is the magnitude of the change in the momentum of the ball?
| 1. | \(0\) | 2. | \(mv\) |
| 3. | \(2mv\) | 4. | \(2mv \cos\theta\) |
Subtopic: Newton's Laws |
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At time \(t=0~\text{s},\) two dung beetles are pushing a small ball of mass \(0.5~\text{g}.\) One pushes with a force of \(0.0015~\text{N}\) toward the east, while the other pushes with a force of \(0.0010~\text{N}\) toward the west. What is the acceleration of the ball at \(t=0~\text{s}?\)
| 1. | \(1~\text{m/s}^2\) | 2. | \(2.5~\text{m/s}^2\) |
| 3. | \(3~\text{m/s}^2\) | 4. | \(5~\text{m/s}^2\) |
Subtopic: Newton's Laws |
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