Force and Laws of Motion

Question 7: Rocket works on the principle of conservation of

Science Exemplar

Class 9

NCERT Exemplar

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Chapter 9: Force and Laws of Motion

18 questions

Question 6: An object of mass 2 kg is sliding with a constant velocity of

4 m s^{-1}

on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

Question 7:
Rocket works on the principle of conservation of

Question 8:
A water tanker filled up to

\frac{2}{3}

of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would

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Question

Question 7:
Rocket works on the principle of conservation of

mass

energy

momentum

velocity

Views: 5,565 students

Updated on: Mar 30, 2023

Book:

Science Exemplar (NCERT Exemplar)

Text solutionVerified

Answer: Rocket works on the conservation of momentum. In a rocket, the fuel burns and produces gas at high temperature. These gases are ejected out of the rocket from a nozzle at the backside of the rocket. The ejecting gas exerts a forward force on the rocket which helps in accelerating.
Though the mass of gases escaping per second is very small and their momentum is very large due to their tremendous velocity of escape. An equal and opposite momentum is imparted to the rocket which despite its large mass builds up a high velocity.

Hence, the correct answer is option C.

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Practice more questions from Science Exemplar (NCERT Exemplar)

Question 6: An object of mass 2 kg is sliding with a constant velocity of

4 m s^{-1}

on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

Question 7:
Rocket works on the principle of conservation of

Question 8:
A water tanker filled up to

\frac{2}{3}

of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would

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Question Text	Question 7: Rocket works on the principle of conservation of
Updated On	Mar 30, 2023
Topic	Force and Laws of Motion
Subject	Science
Class	Class 9
Answer Type	Text solution:1 Video solution: 4
Upvotes	399
Avg. Video Duration	10 min

Question 7:
Rocket works on the principle of conservation of

Text solutionVerified

Video solutions (4)

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Question 7:
Rocket works on the principle of conservation of