The velocity of a body of mass 10 kg increases from 4 m / s to 8 m / s when a force acts on it for 2 s . What is the momentum before the force acts?

Given, Mass of body, m = 10 kg Initial velocity, u = 4 m / s Final velocity, v = 8 m / s Time, t = 2 s We know that momentum of a body is product of mass and velocity. Momentum of the body before force acts, P = m × u = 10 × 4 = 40 kg m / s .

The velocity of a body of mass 10 kg increases from 4 m / s to 8 m / s when a force acts on it for 2 s . What is the momentum after the force acts?

Given, Mass of body, m = 10 kg Initial velocity, u = 4 m / s Final velocity, v = 8 m / s Time, t = 2 s We know that momentum is product of mass and velocity. Momentum after force acts, P = m × v = 10 × 8 = 80 kg m / s .

The velocity of a body of mass 10 kg increases from 4 m / s to 8 m / s when a force acts on it for 2 s . What is the gain in momentum per second?

Given Mass of body, m = 10 kg Initial velocity, u = 4 m / s Velocity after force acts, v = 8 m / s Time taken, t = 2 s We know that momentum os product of mass and velocity. Momentum before force acts, p 1 = m × u = 10 × 4 = 40 kg m / s . Momentum after force acts, p 2 = m × v = 10 × 8 = 80 kg m / s . Momentum gained = p 2 - p 1 = 80 - 40 = 40 kg m / s . Momentum gained per second or rate of change in momentum is called force, given by Newton's second law of motion, F = 40 kg m / s 2 s = 20 kg m / s 2 .

The velocity of a body of mass 10 kg increases from 4 m / s to 8 m / s when a force acts on it for 2 s . What is the value of the force?

Given Mass of body, m = 10 kg Initial velocity, u = 4 m / s Velocity after force acts, v = 8 m / s Time taken, t = 2 s According to the Newton's second law of motion, Force, F = m v - u t = 10 8 - 4 2 = 20 m / s 2

MEDIUM

9th CBSE

IMPORTANT

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Diagrammatically show the difference in three types of muscle fibres.

Important Questions on Model Test Paper (As per The Latest Marking Scheme)

EASY

9th CBSE

IMPORTANT

Science for Ninth Class Part 1 Physics>Chapter 6 - Model Test Paper (As per The Latest Marking Scheme)>MODEL TEST PAPER (As per the latest marking scheme)>Q 18

Distinguish between prokaryotic and eukaryotic cells.

MEDIUM

9th CBSE

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Science for Ninth Class Part 1 Physics>Chapter 6 - Model Test Paper (As per The Latest Marking Scheme)>MODEL TEST PAPER (As per the latest marking scheme)>Q 19

Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.

HARD

9th CBSE

IMPORTANT

Science for Ninth Class Part 1 Physics>Chapter 6 - Model Test Paper (As per The Latest Marking Scheme)>MODEL TEST PAPER (As per the latest marking scheme)>Q 20

When $5 g$ of calcium is burnt in $2 g$ of oxygen, then $7 g$ of calcium oxide is produced. What mass of calcium oxide will be produced when $5 g$ of calcium is burnt in $20 g$ of oxygen? Which law of chemical combination will govern your answer?

EASY

9th CBSE

IMPORTANT

Science for Ninth Class Part 1 Physics>Chapter 6 - Model Test Paper (As per The Latest Marking Scheme)>MODEL TEST PAPER (As per the latest marking scheme)>Q 21

The velocity of a body of mass

10 kg

increases from

4 m / s

8 m / s

when a force acts on it for

2 s

. What is the momentum before the force acts?

EASY

9th CBSE

IMPORTANT

Science for Ninth Class Part 1 Physics>Chapter 6 - Model Test Paper (As per The Latest Marking Scheme)>MODEL TEST PAPER (As per the latest marking scheme)>Q 22

The velocity of a body of mass

10 kg

increases from

4 m / s

8 m / s

when a force acts on it for

2 s

. What is the momentum after the force acts?

MEDIUM

9th CBSE

IMPORTANT

Science for Ninth Class Part 1 Physics>Chapter 6 - Model Test Paper (As per The Latest Marking Scheme)>MODEL TEST PAPER (As per the latest marking scheme)>Q 23

The velocity of a body of mass

10 kg

increases from

4 m / s

8 m / s

when a force acts on it for

2 s

. What is the gain in momentum per second?

EASY

9th CBSE

IMPORTANT

Science for Ninth Class Part 1 Physics>Chapter 6 - Model Test Paper (As per The Latest Marking Scheme)>MODEL TEST PAPER (As per the latest marking scheme)>Q 24

The velocity of a body of mass

10 kg

increases from

4 m / s

8 m / s

when a force acts on it for

2 s

. What is the value of the force?

EASY

9th CBSE

IMPORTANT

Science for Ninth Class Part 1 Physics>Chapter 6 - Model Test Paper (As per The Latest Marking Scheme)>MODEL TEST PAPER (As per the latest marking scheme)>Q 25

The hanging bob of a simple pendulum is displaced to one extreme position

B

and then released. It swings towards centre position

A

and then to the other position

C

. In which position does the bob have Maximum potential energy? Give reasons for your answer.

Diagrammatically show the difference in three types of muscle fibres.

Important Questions on Model Test Paper (As per The Latest Marking Scheme)

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