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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
Q1
Given , which of the following statements are correct.
(a) must each be a null vector,
(b) The magnitude of () equals the magnitude of (),
(c) The magnitude of can never be greater than the sum of the magnitudes of and ,
(d) must lie in the plane of and if and are not collinear, and in the line of and , if they are collinear ?
(a) must each be a null vector,
(b) The magnitude of () equals the magnitude of (),
(c) The magnitude of can never be greater than the sum of the magnitudes of and ,
(d) must lie in the plane of and if and are not collinear, and in the line of and , if they are collinear ?
Q2
Three girls skating on a circular ice ground of radius start from a point on the edge of the ground and reach a point diametrically opposite to following different paths as shown in Fig. What is the magnitude of the displacement vector for each ? For which girl is this equal to the actual length of path skate ?
Q3
A cyclist starts from the center O of a circular park of radius 1 km, reaches the edge P of the park, then cycles along the circumference, and returns to the center along QO as shown in Fig. If the round trip takes 10 , what is the
(a) Net displacement,(b) Average velocity, and
(c) The average speed of the cyclist?
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
8
Chapter 8: Gravitation
33 questions
Question
Easy
Solving time: 1 mins
Three girls skating on a circular ice ground of radius start from a point on the edge of the ground and reach a point diametrically opposite to following different paths as shown in Fig. What is the magnitude of the displacement vector for each ? For which girl is this equal to the actual length of path skate ?
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Three girls skating on a circular ice ground of radius start from a point on the edge of the ground and reach a point diametrically opposite to following different paths as shown in Fig. What is the magnitude of the displacement vector for each ? For which girl is this equal to the actual length of path skate ?
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Text solution
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Displacement is given by the imum distance between the initial and final positions of a particle. In the given case, all the girls start from point P and reach point Q. The magnitudes of their displacements will be equal to the diameter of the ground.
The radius of the ground
Diameter of the ground
Hence, the magnitude of the displacement for each girl is . This is equal to the actual length of the path skated by girl B.
The radius of the ground
Diameter of the ground
Hence, the magnitude of the displacement for each girl is . This is equal to the actual length of the path skated by girl B.
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Practice more questions from Physics Part-I (NCERT)
Q1
Given , which of the following statements are correct.
(a) must each be a null vector,
(b) The magnitude of () equals the magnitude of (),
(c) The magnitude of can never be greater than the sum of the magnitudes of and ,
(d) must lie in the plane of and if and are not collinear, and in the line of and , if they are collinear ?
(a) must each be a null vector,
(b) The magnitude of () equals the magnitude of (),
(c) The magnitude of can never be greater than the sum of the magnitudes of and ,
(d) must lie in the plane of and if and are not collinear, and in the line of and , if they are collinear ?
Q2
Three girls skating on a circular ice ground of radius start from a point on the edge of the ground and reach a point diametrically opposite to following different paths as shown in Fig. What is the magnitude of the displacement vector for each ? For which girl is this equal to the actual length of path skate ?
Q3
A cyclist starts from the center O of a circular park of radius 1 km, reaches the edge P of the park, then cycles along the circumference, and returns to the center along QO as shown in Fig. If the round trip takes 10 , what is the
(a) Net displacement,(b) Average velocity, and
(c) The average speed of the cyclist?
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| Question Text | Three girls skating on a circular ice ground of radius start from a point on the edge of the ground and reach a point diametrically opposite to following different paths as shown in Fig. What is the magnitude of the displacement vector for each ? For which girl is this equal to the actual length of path skate ? |
| Updated On | Jul 6, 2023 |
| Topic | Motion in a Plane |
| Subject | Physics |
| Class | Class 11 |
| Answer Type | Text solution:1 Video solution: 9 |
| Upvotes | 876 |
| Avg. Video Duration | 5 min |
