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Physics Part-I

Laws of motion

A batsman deflects a ball by an angle of 90^o without changing

Physics Part-I

Class 11

NCERT

Chapter 1: Physical World

16 questions

Chapter 2: Units and Measurements

51 questions

Chapter 3: Motion in Straight Line

50 questions

Chapter 4: Motion in a Plane

43 questions

Chapter 5: Laws of motion

52 questions

A shell of mass

0.020 k g

is fired by a gun of mass

100 k g

. If the muzzle speed of the shell is

80 m / s

, what is the recoil speed of the gun?

A batsman deflects a ball by an angle of

9 0^{o}

without changing its initial speed, which is equal to

54 km / h r

. What is the impulse imparted to the ball? (Mass of the ball is

0.15 k g

A stone of mass

0.25 k g

tied to the end of a string is whirled round in a circle of radius

1.5 m

with a speed of

40 re v ./

in a horizontal plane. What is the tension in the string? What is the maximum speed with which the stone can be whirled around if the string can withstand a maximum tension of

200 N

View all question

Chapter 6: Work, Energy and Power

41 questions

Chapter 7: System of Particles and Rotational Motion

45 questions

Chapter 8: Gravitation

33 questions

Question

Easy

Solving time: 2 mins

A batsman deflects a ball by an angle of $9 0^{o}$ without changing its initial speed, which is equal to $54 km / h r$ . What is the impulse imparted to the ball? (Mass of the ball is $0.15 k g$ ).

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Updated on: Feb 2, 2024

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Physics Part-I (NCERT)

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A batsman deflects a ball by an angle of

9 0^{o}

without changing its initial speed, which is equal to

54 km / h r

. What is the impulse imparted to the ball? (Mass of the ball is

0.15 k g

15 mins ago

Discuss this question LIVE

15 mins ago

Text solutionVerified

Given,

Mass of the ball

m = 0.15 k g

The initial speed of the ball

u = 54 km / h = \frac{54 \times 1000}{60 \times 60} = 15 m / s

The final speed of the ball

v_{f} = u cos 4 5^{0}

The momentum change takes place in the ball in the vertical direction only because the initial and final momentum in the horizontal direction is canceled out.

v_{i} = - u cos 4 5^{0}

According to the impulse-momentum theorem,

I m p u l se = C han g e in m o m e n t u m

\Rightarrow I = m (v_{f} - v_{i})

I = m u cos 4 5^{0} - (- m u cos 4 5^{0})

I = 2 m u cos 4 5^{0}

Substitute the value of mass and velocity.

I = 2 \times 0.15 \times 15 \times 0.7071

I = 3.19 k g m / s

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Practice more questions from Physics Part-I (NCERT)

A shell of mass

0.020 k g

is fired by a gun of mass

100 k g

. If the muzzle speed of the shell is

80 m / s

, what is the recoil speed of the gun?

A batsman deflects a ball by an angle of

9 0^{o}

without changing its initial speed, which is equal to

54 km / h r

. What is the impulse imparted to the ball? (Mass of the ball is

0.15 k g

A stone of mass

0.25 k g

tied to the end of a string is whirled round in a circle of radius

1.5 m

with a speed of

40 re v ./

in a horizontal plane. What is the tension in the string? What is the maximum speed with which the stone can be whirled around if the string can withstand a maximum tension of

200 N

View all

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Question Text	A batsman deflects a ball by an angle of $9 0^{o}$ without changing its initial speed, which is equal to $54 km / h r$ . What is the impulse imparted to the ball? (Mass of the ball is $0.15 k g$ ).
Updated On	Feb 2, 2024
Topic	Laws of motion
Subject	Physics
Class	Class 11
Answer Type	Text solution:1 Video solution: 20
Upvotes	2012
Avg. Video Duration	7 min

A batsman deflects a ball by an angle of $9 0^{o}$ without changing its initial speed, which is equal to $54 km / h r$ . What is the impulse imparted to the ball? (Mass of the ball is $0.15 k g$ ).

Text solutionVerified

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Text solutionVerified

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A batsman deflects a ball by an angle of $9 0^{o}$ without changing its initial speed, which is equal to $54 km / h r$ . What is the impulse imparted to the ball? (Mass of the ball is $0.15 k g$ ).