9 PhysicsMaster

Brinda

Asked: December 14, 2020In: Class 9 Science

A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then calculate: (a) the net accelerating force; (b) the acceleration of the train; and (c) the force of wagon 1 on wagon 2.

NCERT Solutions for Class 9 Science Chapter 9 Force and Laws of Motion NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-128 Questions No-7

Poll

Brinda

Asked: December 14, 2020In: Class 9 Science

A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because

NCERT Solutions for Class 9 Science Chapter 9 Force and Laws of Motion NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-128 Questions No-4

Brinda

Asked: December 14, 2020In: Class 9 Social Science

From a rifle of mass 4 kg, a bullet of mass 50 g is fired with an initial velocity of 35 m s⁻¹. Calculate the initial recoil velocity of the rifle.

NCERT Solutions for Class 9 Science Chapter 9 Force and Laws of Motion NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-126 Questions No-3

Rudra Rustagi

Asked: October 28, 2020In: Class 9

What do you mean by acceleration due to gravity?

NCERT Solutions for Class 9 Science Chapter 10 Important NCERT Questions Gravitation NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-136 Questions No-2

Rudra Rustagi

Asked: October 28, 2020In: Class 9

What are the differences between the mass of an object and its weight?

NCERT Solutions for Class 9 Science Chapter 10 Important NCERT Questions Gravitation NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-138 Questions No-1

Rudra Rustagi

Asked: October 28, 2020In: Class 9

Why is it difficult to hold a school bag having a strap made of a thin and strong string?

NCERT Solutions for Class 9 Science Chapter 10 Important NCERT Questions Gravitation NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-138 Questions No-1

Rudra Rustagi

Asked: October 28, 2020In: Class 9

What do you mean by buoyancy?

NCERT Solutions for Class 9 Science Chapter 10 Important NCERT Questions Gravitation NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-138 Questions No-2

Rudra Rustagi

Asked: October 28, 2020In: Class 9

Why does an object float or sink when placed on the surface of water?

NCERT Solutions for Class 9 Science Chapter 10 Important NCERT Questions Gravitation NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-138 Questions No-3

Rudra Rustagi

Asked: October 28, 2020In: Class 9

You find your mass to be 42 kg on a weighing machine. Is your mass more or less than 42 kg?

NCERT Solutions for Class 9 Science Chapter 10 Important NCERT Questions Gravitation NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-142 Questions No-1

karin joseph

Asked: October 28, 2020In: Class 9

You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why?

NCERT Solutions for Class 9 Science Chapter 10 Important NCERT Questions Gravitation NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-142 Questions No-2

9 PhysicsMaster

A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then calculate: (a) the net accelerating force; (b) the acceleration of the train; and (c) the force of wagon 1 on wagon 2.

A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because

What do you mean by acceleration due to gravity?

What are the differences between the mass of an object and its weight?

Why is it difficult to hold a school bag having a strap made of a thin and strong string?

What do you mean by buoyancy?

Why does an object float or sink when placed on the surface of water?

You find your mass to be 42 kg on a weighing machine. Is your mass more or less than 42 kg?

You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why?

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