Tiwari Academy Discussion

Priti Patel

Asked: October 28, 2020In: Class 9

A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.

NCERT Solutions for Class 9 Science Chapter 11 Important NCERT Questions Work and Energy NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-159 Questions No-13

Priti Patel

Asked: October 28, 2020In: Class 9

An electric heater is rated 1500 W. How much energy does it use in 10 hours?

NCERT Solutions for Class 9 Science Chapter 11 Important NCERT Questions Work and Energy NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-159 Questions No-14

Priti Patel

Asked: October 28, 2020In: Class 9

Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?

NCERT Solutions for Class 9 Science Chapter 11 Important NCERT Questions Work and Energy NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-159 Questions No-15

Priti Patel

Asked: October 28, 2020In: Class 9

An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?

NCERT Solutions for Class 9 Science Chapter 11 Important NCERT Questions Work and Energy NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-159 Questions No-16

Priti Patel

Asked: October 28, 2020In: Class 9

Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?

NCERT Solutions for Class 9 Science Chapter 11 Important NCERT Questions Work and Energy NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-159 Questions No-17

Priti Patel

Asked: October 28, 2020In: Class 9

Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?

NCERT Solutions for Class 9 Science Chapter 11 Important NCERT Questions Work and Energy NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-159 Questions No-19

Priti Patel

Asked: October 28, 2020In: Class 9

Find the energy in kW h consumed in 10 hours by four devices of power 500 W each.

NCERT Solutions for Class 9 Science Chapter 11 Important NCERT Questions Work and Energy NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-159 Questions No-20

Priti Patel

Asked: October 28, 2020In: Class 9

A freely falling object eventually stops on reaching the ground. What happenes to its kinetic energy?

NCERT Solutions for Class 9 Science Chapter 11 Important NCERT Questions Work and Energy NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-159 Questions No-21

Chandan Guptas

Asked: October 20, 2020In: Class 10

What is meant by power of accommodation of the eye?

NCERT Solution for Class 10 Science Chapter 11 The Human Eye and the Colorful World NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-190 Questions No-1

Chandan Guptas

Asked: October 20, 2020In: Class 10

A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?

NCERT Solution for Class 10 Science Chapter 11 The Human Eye and the Colourful World NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-190 Questions No-2

A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.

An electric heater is rated 1500 W. How much energy does it use in 10 hours?

Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?

An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?

Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?

Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?

Find the energy in kW h consumed in 10 hours by four devices of power 500 W each.

A freely falling object eventually stops on reaching the ground. What happenes to its kinetic energy?

What is meant by power of accommodation of the eye?

A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?

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