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An astronaut accidentally gets separated out of his small spaceship accelerating in interstellar space at a constant rate of 100 $\mathrm{m}/{\mathrm{s}}^{2}$. What is the acceleration of the astronaut the instant after he is outside the spaceship?

(Assume that there are no nearby stars to exert gravitational force on him.)

1. 0 $\mathrm{m}/{\mathrm{s}}^{2}$

2. 100 $\mathrm{m}/{\mathrm{s}}^{2}$

3. 10 $\mathrm{m}/{\mathrm{s}}^{2}$

4. 1000 $\mathrm{m}/{\mathrm{s}}^{2}$

Subtopic: Newton's Laws |

64%

From NCERT

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A bullet of mass 0.04 kg moving with a speed of 90 m/s enters a heavy fixed wooden block and is stopped after a distance of 60 cm. The average resistive force exerted by the block on the bullet is:

1. 0 N

2. 270 N

3. 370 N

4. 290 N

Subtopic: Application of Laws |

84%

From NCERT

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The motion of a particle of mass \(m\) is described by \(y=ut+\frac{1}{2}gt^{2}.\) The force acting on the particle is:

1. \(3mg\)

2. \(mg\)

3. \(\frac{mg}{2}\)

4. \(2mg\)

Subtopic: Application of Laws |

87%

From NCERT

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A batsman hits back a ball straight in the direction of the bowler without changing its initial speed of \(12\) m/s. If the mass of the ball is \(0.15\) kg, then the impulse imparted to the ball is:

(Assume linear motion of the ball.)

1. \(0.15\) N-s

2. \(3.6\) N-s

3. \(36\) N-s

4. \(0.36\) N-s

Subtopic: Newton's Laws |

87%

From NCERT

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Two identical billiard balls strike a rigid wall with the same speed but at different angles, and get reflected without any change in speed, as shown in the figure. The ratio of the magnitudes of impulses imparted to the balls by the wall is:

1. \(2:3\)

2. \(\sqrt{3}:2\)

3. \(2:\sqrt{3}\)

4. \(1:1\)

Subtopic: Newton's Laws |

77%

From NCERT

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See the figure given below. A mass of \(6\) kg is suspended by a rope of length \(2\) m from the ceiling. A force of \(50\) N is applied at the mid-point \(P\) of the rope in the horizontal direction, as shown. What angle does the rope make with the vertical in equilibrium? (Take \(g=10\) ${\mathrm{ms}}^{-2}$). Neglect the mass of the rope.

1. \(90^\circ\)

2. \(30^\circ\)

3. \(40^\circ\)

4. \(0^\circ\)

Subtopic: Application of Laws |

65%

From NCERT

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Determine the maximum acceleration of the train in which a box lying on its floor will remain stationary, given that the coefficient of static friction between the box and the train’s floor is \(0.15.\)

1. \(0\)

2. \(0.5~\mathrm{m/s^2}\)

3. \(2.5~\mathrm{m/s^2}\)

4. \(1.5~\mathrm{m/s^2}\)

Subtopic: Friction |

78%

From NCERT

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See the figure given below, a mass of \(4\) kg rests on a horizontal plane. The plane is gradually inclined until at an angle \(\theta=15^\circ\) with the horizontal, the mass just begins to slide. What is the coefficient of static friction between the block and the surface?

1. \(0.27\)

2. \(0.53\)

3. \(0.23\)

4. \(0.25\)

Subtopic: Friction |

59%

From NCERT

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What is the acceleration of the block and tension in the string of the block and trolley system shown in a figure, if the coefficient of kinetic friction between the trolley and the surface is \(0.04\)? (Take \(g=10~\mathrm{m/s^2}\)${\mathrm{}}^{}$). Neglect the mass of the string.

1. | \(9.6~\mathrm{m/s^2}\) and \(27.1~\mathrm{N}\) |

2. | \(9.6~\mathrm{m/s^2}\) and \(2.71~\mathrm{N}\) |

3. | \(0.96~\mathrm{m/s^2}\) and \(27.1~\mathrm{N}\) |

4. | \(0.63~\mathrm{m/s^2}\) and \(30~\mathrm{N}\) |

Subtopic: Application of Laws |

68%

From NCERT

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A cyclist speeding at 18 km/h on a level road takes a sharp circular turn of radius 3 m without reducing the speed. The coefficient of static friction between the tyres and the road is 0.1. Will the cyclist slip while taking the turn?

1. | no |

2. | yes |

3. | data insufficient |

4. | depends on the weight of the cyclist |

Subtopic: Friction |

70%

From NCERT

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