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A person holds a bundle of hay over his head for 30 minutes an
Science
Science

Class 9

NCERT

Publisher:
NCERT
Subject:
Science
1

Chapter 1: Matter in Our Surroundings

9 questions

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2

Chapter 2: Is Matter Around Us Pure?

13 questions

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3

Chapter 3: Atoms and Molecules

16 questions

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4

Chapter 4: Structure of the Atom

19 questions

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5

Chapter 5: The Fundamental Unit of Life

10 questions

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6

Chapter 6: Tissues

15 questions

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7

Chapter 7: Diversity in Living Organisms

6 questions

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8

Chapter 8: Motion

18 questions

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9

Chapter 9: Force and Laws of Motion

29 questions

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10

Chapter 10: Work and Energy

23 questions

Q1
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
Q2
A person holds a bundle of hay over his head for minutes and gets tired. Has he done some work or not? Justify your answer.
Q3
An electric heater is rated . How much energy does it use in hours?
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11

Chapter 11: Sound

25 questions

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12

Chapter 12: Why do We Fall Ill?

6 questions

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13

Chapter 13: Natural Resourses

6 questions

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14

Chapter 14: Improvement in Food Resources

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15

Chapter 15: Gravitation

29 questions

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Question
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Solving time: 3 mins

A person holds a bundle of hay over his head for minutes and gets tired. Has he done some work or not? Justify your answer.

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Updated on: Jan 17, 2023

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Science (NCERT)

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A person holds a bundle of hay over his head for minutes and gets tired. Has he done some work or not? Justify your answer.
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Text SolutionText solutionverified iconVerified

The person does not move from his position (no displacement) in spite of applying force on the bundle. Therefore, no work is done.
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Q1
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
Q2
A person holds a bundle of hay over his head for minutes and gets tired. Has he done some work or not? Justify your answer.
Q3
An electric heater is rated . How much energy does it use in hours?
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Question Text
A person holds a bundle of hay over his head for minutes and gets tired. Has he done some work or not? Justify your answer.
Updated OnJan 17, 2023
TopicWork and Energy
SubjectScience
ClassClass 9
Answer TypeText solution:1 Video solution: 8
Upvotes918
Avg. Video Duration5 min