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Physics Part-I
Class 11
NCERT
1
Chapter 1: Physical World
16 questions
2
Chapter 2: Units and Measurements
51 questions
3
Chapter 3: Motion in Straight Line
50 questions
4
Chapter 4: Motion in a Plane
43 questions
5
Chapter 5: Laws of motion
52 questions
Q1
A stone of mass tied to the end of a string is whirled round in a circle of radius with a speed of in a horizontal plane. What is the tension in the string? What is the maximum speed with which the stone can be whirled around if the string can withstand a maximum tension of ?
Q2
The speed of the stone is increased beyond the maximum permissible value, and the string breaks suddenly, which of the following correctly describes the trajectory of the stone after the string breaks:
(a) the stone moves radially outwards,
(b) the stone flies off tangentially from the instant the string breaks,
(c) the stone flies off at an angle with the tangent whose magnitude depends on the speed of the particle.
Q3
Explain why
(a) A horse cannot pull a cart and run in empty space.
(b) Passengers are thrown forward from their seats when a speeding bus stops suddenly.
(c) It is easier to pull a lawn mower than to push it.
(d) A cricketer moves his hands backwards while holding a catch.
6
Chapter 6: Work, Energy and Power
41 questions
7
Chapter 7: System of Particles and Rotational Motion
45 questions
8
Chapter 8: Gravitation
33 questions
Question
Easy
Solving time: 1 mins
The speed of the stone is increased beyond the maximum permissible value, and the string breaks suddenly, which of the following correctly describes the trajectory of the stone after the string breaks:(a) the stone moves radially outwards,(b) the stone flies off tangentially from the instant the string breaks,(c) the stone flies off at an angle with the tangent whose magnitude depends on the speed of the particle.
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Text solution
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When a stone tied to a string is made to move in a circular path, the speed of the stone at any instant will be tangential to the path of the stone. The instant at which the string breaks, the stone will start to move along the tangent in the direction of the velocity at that instant.
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Practice more questions from Physics Part-I (NCERT)
Q1
A stone of mass tied to the end of a string is whirled round in a circle of radius with a speed of in a horizontal plane. What is the tension in the string? What is the maximum speed with which the stone can be whirled around if the string can withstand a maximum tension of ?
Q2
The speed of the stone is increased beyond the maximum permissible value, and the string breaks suddenly, which of the following correctly describes the trajectory of the stone after the string breaks:
(a) the stone moves radially outwards,
(b) the stone flies off tangentially from the instant the string breaks,
(c) the stone flies off at an angle with the tangent whose magnitude depends on the speed of the particle.
Q3
Explain why
(a) A horse cannot pull a cart and run in empty space.
(b) Passengers are thrown forward from their seats when a speeding bus stops suddenly.
(c) It is easier to pull a lawn mower than to push it.
(d) A cricketer moves his hands backwards while holding a catch.
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| Question Text | The speed of the stone is increased beyond the maximum permissible value, and the string breaks suddenly, which of the following correctly describes the trajectory of the stone after the string breaks: (a) the stone moves radially outwards, (b) the stone flies off tangentially from the instant the string breaks, (c) the stone flies off at an angle with the tangent whose magnitude depends on the speed of the particle. |
| Updated On | Mar 5, 2022 |
| Topic | Laws of motion |
| Subject | Physics |
| Class | Class 11 |
| Answer Type | Text solution:1 Video solution: 1 |
| Upvotes | 181 |
| Avg. Video Duration | 6 min |
