Tiwari Academy Discussion

Asked: October 28, 2020In: Class 9

The volume of 50 g of a substance is 20 cm^3. If the density of water is 1 g cm^–3, will the substance float or sink?

NCERT Solutions for Class 9 Science Chapter 10 Important NCERT Questions Gravitation NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-145 Questions No-21

Nirav Jaiswal

Asked: October 28, 2020In: Class 9

The volume of a 500 g sealed packet is 350 cm^3. Will the packet float or sink in water if the density of water is 1 g cm^–3? What will be the mass of the water displaced by this packet?

NCERT Solutions for Class 9 Science Chapter 10 Important NCERT Questions Gravitation NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-145 Questions No-22

Taara Sharma

Asked: October 28, 2020In: Class 9

When do we say that work is done?

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 Intext Questions Page No-149 Questions No-1

Taara Sharma

Asked: October 28, 2020In: Class 9

Write an expression for the work done when a force is acting on an object in the direction of its displacement.

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 Intext Questions Page No-149 Questions No-2

Taara Sharma

Asked: October 28, 2020In: Class 9

Define 1 J of work.

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 Intext Questions Page No-149 Questions No-3

Taara Sharma

Asked: October 28, 2020In: Class 9

A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?

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 Intext Questions Page No-149 Questions No-4

Taara Sharma

Asked: October 28, 2020In: Class 9

What is the kinetic energy of an object?

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 Intext Questions Page No-152 Questions No-1

Taara Sharma

Asked: October 28, 2020In: Class 9

Write an expression for the kinetic energy of an object.

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 Intext Questions Page No-152 Questions No-2

Taara Sharma

Asked: October 28, 2020In: Class 9

The kinetic energy of an object of mass, m moving with a velocity of 5 m s^–1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?

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 Intext Questions Page No-152 Questions No-3

Taara Sharma

Asked: October 28, 2020In: Class 9

What is power?

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 Intext Questions Page No-156 Questions No-1

The volume of 50 g of a substance is 20 cm^3. If the density of water is 1 g cm^–3, will the substance float or sink?

The volume of a 500 g sealed packet is 350 cm^3. Will the packet float or sink in water if the density of water is 1 g cm^–3? What will be the mass of the water displaced by this packet?

When do we say that work is done?

Write an expression for the work done when a force is acting on an object in the direction of its displacement.

Define 1 J of work.

A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?

What is the kinetic energy of an object?

Write an expression for the kinetic energy of an object.

The kinetic energy of an object of mass, m moving with a velocity of 5 m s^–1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?

What is power?

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