A neutron m a s s 1 . 67 × 10 - 27 kg moving at a speed of 1 . 0 × 10 8 ms - 1 collides with a deuteron mass 3 . 34 × 10 - 27 kg at rest and sticks to it. Find the speed of the composite particle triton.

Given: Mass of neutron = 1 . 67 × 10 - 27 kg Speed of neutron = 10 8 m / sec Mass of deuteron = 3 . 34 × 10 - 29 kg Speed of deuteron = 0 Applying law of conservation of momenta m n × v n + m d v d = m n + m d v 1 . 67 × 10 - 27 × 10 8 + 0 = 5 . 01 × 10 - 27 × v ∴ v = 1 . 67 × 10 8 5 . 01 = 3 . 3 × 10 7 m / sec Velocity of combination = 3 . 3 × 10 7 m / sec

E M B I B E

ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 26

HARD

11th ICSE

IMPORTANT

Earn 100

A block of wood of mass $5 kg$ is suspended by a thread. A gun is fired in the horizontal direction and the bullet strikes the block and is embedded in it. As a result, the block is raised to $15 cm$ . If the mass of the bullet be $20 g$ , find the initial velocity of the bullet. $(g = 9.8 {ms}^{- 2})$

Important Questions on Work, Power and Energy

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 27

A bullet of mass

0.02 kg

moving with a speed of

200 {ms}^{- 1}

strikes a

2 kg

wooden block suspended by a

1 m

long thread and is embedded in the block. What is the maximum inclination of the thread with the vertical?

(g = 9.8 {ms}^{- 2})

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 28

A $1 kg$ body falls freely under gravity. Find its momentum and K.E. $5 \sec$ after it starts falling.

Take $g = 10 m s^{- 2}$ .

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 29

If the momentum of a body is increased by

50 %

, what will be the percentage increase in the kinetic energy of the body?

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 30

Find the ratio of kinetic energies of two bodies of masses

1 kg

and

4 kg

having equal linear momenta.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 31

Find the ratio of linear momenta of two bodies of masses

1 kg

and

4 kg

having equal kinetic energies.

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 32

A stationary bomb explodes into

2

fragments of masses

0.4 kg

and

4 kg

. If the bigger fragment has a K.E. of

100 joule

. Find the kinetic energy of the smaller fragment.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 33

A neutron

(m a s s 1.67 \times 10^{- 27} kg)

moving at a speed of

1.0 \times 10^{8} {ms}^{- 1}

collides with a deuteron

(mass 3.34 \times 10^{- 27} kg)

at rest and sticks to it. Find the speed of the composite particle triton.

EASY

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 10 - Work, Power and Energy>NUMERICALS>Q 34

A $20 kg$ mass which is moving with a speed of $10 {ms}^{- 1}$ strikes a stationary mass of $5 kg$ . After collision the masses stick together. With what speed does the combined mass move?