What is upthrust? What are the quantities that can vary upthrust? How does it account for the floating of a body? When a partially immersed body is pressed down a little, what will happen to the upthrust?

Important Questions on Gravitation

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>CHAPTER EXERCISE>Q 24

How does a boat float in water?

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>CHAPTER EXERCISE>Q 24

State two factors on which magnitude of buoyant force acting on a body, immersed in a fluid depends.

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>CHAPTER EXERCISE>Q 24

A block of wood can float while a similar sized block of concrete can be used as an anchor. Why?

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>CHAPTER EXERCISE>Q 25

How does the force of attraction between the two bodies depend upon their masses and distance between them? A student thought that two bricks tied together would fall faster than a single one under the action of gravity. Do you agree with his hypothesis or not? Comment.

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>Challengers*>Q 1

If a satellite is revolving around a planet of mass

M

in an elliptical orbit of semi-major axis

a

, find the orbital speed of the satellite when it is at a distance

r

from the focus.

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 10 - Gravitation>Challengers*>Q 2

Distance between the centres of two stars is $10 a$ . The masses of these stars are $M$ and $16 M$ and their radii are $a$ and $2 a$ respectively. A body of mass $m$ is fired straight from the surface of the larger star towards the smaller star. The minimum initial speed for the body to reach the surface of the smaller star is _____.