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
6
Chapter 6: Work, Energy and Power
41 questions
7
Chapter 7: System of Particles and Rotational Motion
45 questions
Q1
In the HCl molecule, the separation between the nuclei of the two atoms is about . Find the approximate location of the CM of the molecule, given that a chlorine atom is about 35.5 times as massive as a hydrogen atom and nearly all the mass of an atom is concentrated in its nucleus.
Q2
A child sits stationary at one end of a long trolley moving uniformly with a speed V on a smooth horizontal floor. If the child gets up and runs about on the trolley in any manner, what is the speed of the CM of the (trolley + child) system ?
Q3
Show that the area of the triangle contained between the vectors and is one half of the magnitude of .
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Chapter 8: Gravitation
33 questions
Question
Medium
Solving time: 1 mins
A child sits stationary at one end of a long trolley moving uniformly with a speed V on a smooth horizontal floor. If the child gets up and runs about on the trolley in any manner, what is the speed of the CM of the (trolley + child) system ?
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The child is running arbitrarily on a trolley moving with velocity V. However, the running of the child will produce no effect on the velocity of the centre of mass of the trolley. This is because the force due to the boy’s motion is purely internal. Since no external force is involved in the boy–trolley system, the boy’s motion will produce no change in the velocity of the centre of mass of the trolley.
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Practice more questions from Physics Part-I (NCERT)
Q1
In the HCl molecule, the separation between the nuclei of the two atoms is about . Find the approximate location of the CM of the molecule, given that a chlorine atom is about 35.5 times as massive as a hydrogen atom and nearly all the mass of an atom is concentrated in its nucleus.
Q2
A child sits stationary at one end of a long trolley moving uniformly with a speed V on a smooth horizontal floor. If the child gets up and runs about on the trolley in any manner, what is the speed of the CM of the (trolley + child) system ?
Q3
Show that the area of the triangle contained between the vectors and is one half of the magnitude of .
View allPractice questions from Physics Part-I (NCERT)
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(a) How much is the force of friction acting on the cylinder ?
(b) What is the work done against friction during rolling ?
(c) If the inclination of the plane is increased, at what value of does the cylinder begin to skid, and not roll perfectly ?
Question 3
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Question 4
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(a) Compute the angular acceleration of the wheel.
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(d) Compare answers to parts (b) and (c).
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| Question Text | A child sits stationary at one end of a long trolley moving uniformly with a speed V on a smooth horizontal floor. If the child gets up and runs about on the trolley in any manner, what is the speed of the CM of the (trolley + child) system ? |
| Updated On | Feb 11, 2023 |
| Topic | System of Particles and Rotational Motion |
| Subject | Physics |
| Class | Class 11 |
| Answer Type | Text solution:1 Video solution: 4 |
| Upvotes | 529 |
| Avg. Video Duration | 9 min |
