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Physics Part-I

Laws of motion

A helicopter of mass 1000 kg rises with a vertical acceleratio

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 stone of mass m tied to the end of a string revolves in a vertical circle of radius R.The net forces at the lowest and highest points of the circle directed vertically downwards are : [Choose the correct alternative]

A helicopter of mass

1000

k g

rises with a vertical acceleration of

15

m / s^{2}

. The crew and the passengers weigh

300

k g

. Give the magnitude and direction of the(a) Force on the floor by the crew and passengers.(b) Action of the rotor of the helicopter on the surrounding air.(c) Force on the helicopter due to the surrounding air.

A stream of water flowing horizontally with a speed of

15

m s^{- 1}

gushes out of a tube of cross-sectional area

1 0^{- 2}

m^{2}

, and hits a vertical wall nearby. What is the force exerted on the wall by the impact of water, assug it does not rebound ?

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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 helicopter of mass $1000$ $k g$ rises with a vertical acceleration of $15$ $m / s^{2}$ . The crew and the passengers weigh $300$ $k g$ . Give the magnitude and direction of the(a) Force on the floor by the crew and passengers.(b) Action of the rotor of the helicopter on the surrounding air.(c) Force on the helicopter due to the surrounding air.

Name: Video solution 1: [Solved] A helicopter of mass 1000 kg rises with a vertical acceleration of 15 m/s2. The crew and the passengers weigh 300 kg. Give the magnitude and direction of the(a) Force on the floor by the crew and passengers.(b) Action of the rotor of the helicopter on the surrounding air.(c) Force on the helicopter due to the surrounding air. - Physics Part-I
Uploaded: 2022-10-12T10:52:36.000Z
Duration: 7 min
Description: Video solution 1: [Solved] A helicopter of mass 1000 kg rises with a vertical acceleration of 15 m/s2. The crew and the passengers weigh 300 kg. Give the magnitude and direction of the(a) Force on the floor by the crew and passengers.(b) Action of the rotor of the helicopter on the surrounding air.(c) Force on the helicopter due to the surrounding air. - Physics Part-I

Views: 5,782 students

Updated on: Mar 17, 2023

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Physics Part-I (NCERT)

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Elizabeth Discussed

A helicopter of mass

1000

k g

rises with a vertical acceleration of

15

m / s^{2}

. The crew and the passengers weigh

300

k g

8 mins ago

Discuss this question LIVE

8 mins ago

Text solutionVerified

Given:

Mass of the helicopter is,

1000 k g

The total mass of crew and passengers is,

300 k g

Acceleration of the helicopter,

a = 15 m / s^{2}

Total mass of the system,

m_{t} = 1300 k g

(a)

The reaction force applied by the crew and passengers on the floor of the helicopter is given by:

R - m g = ma

= m (g + a)

= 300 \times (10 + 15) = 7500 N

So, the force exerted by the passengers on the floor is

7500 N

(b)

The reaction of the rotor on the surrounding air will be due to the mass of the helicopter as well as the passengers.

R^{'} - m_{t} g = m_{t} a

= m_{t} (g + a)

= 1300 \times (10 + 15) = 32500 N

Thus, the reaction force of the rotor on the surrounding air will be

32500 N

(c)

The force on the helicopter due to the surrounding air will be the reaction of the force applied by the rotor on the air. Therefore, its value will be

32500 N

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Practice more questions from Physics Part-I (NCERT)

A helicopter of mass

1000

k g

rises with a vertical acceleration of

15

m / s^{2}

. The crew and the passengers weigh

300

k g

A stream of water flowing horizontally with a speed of

15

m s^{- 1}

gushes out of a tube of cross-sectional area

1 0^{- 2}

m^{2}

, and hits a vertical wall nearby. What is the force exerted on the wall by the impact of water, assug it does not rebound ?

View all

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Question Text	A helicopter of mass $1000$ $k g$ rises with a vertical acceleration of $15$ $m / s^{2}$ . The crew and the passengers weigh $300$ $k g$ . Give the magnitude and direction of the(a) Force on the floor by the crew and passengers.(b) Action of the rotor of the helicopter on the surrounding air.(c) Force on the helicopter due to the surrounding air.
Updated On	Mar 17, 2023
Topic	Laws of motion
Subject	Physics
Class	Class 11
Answer Type	Text solution:1 Video solution: 2
Upvotes	213
Avg. Video Duration	8 min

Text solutionVerified

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