Why is it easier to swim in dead-sea water than in a pond of fresh water?

Important Questions on Gravitation

MEDIUM

9th CBSE

IMPORTANT

Essentials of PHYSICS Class IX>Chapter 3 - Gravitation>Assignment>Q 27

The relative density of lead is

11.34

. The density of water is

1000 kg / m^{3} .

What is the density of lead in S.I.

EASY

9th CBSE

IMPORTANT

Essentials of PHYSICS Class IX>Chapter 3 - Gravitation>Assignment>Q 28

Why does an iron nail sink in water but a wooden cork floats in water.?

EASY

9th CBSE

IMPORTANT

Essentials of PHYSICS Class IX>Chapter 3 - Gravitation>Assignment>Q 29

Two blocks one of iron and other of wood are immersed in water at the same depth. Will both come upwards? Why?

HARD

9th CBSE

IMPORTANT

Essentials of PHYSICS Class IX>Chapter 3 - Gravitation>Assignment>Q 30

Wheels of iron tank rest on a wide steel belt. Give reason.

MEDIUM

9th CBSE

IMPORTANT

Essentials of PHYSICS Class IX>Chapter 3 - Gravitation>Assignment>Q 31

Why do building have wide foundation?

MEDIUM

9th CBSE

IMPORTANT

Essentials of PHYSICS Class IX>Chapter 3 - Gravitation>Assignment>Q 32

The density of turpentine at $293 K$ is given by $870 kg m^{- 3} .$ Identify and write the names of substances that sink in turpentine at the same temperature.

S. No	Substance	Density $(kg m^{- 3})$
1	Wood	690
2	Ice	920
3	Rubber	970
4	Paraffin	900
5	Cork	240
6	Bone	1850

MEDIUM

9th CBSE

IMPORTANT

Essentials of PHYSICS Class IX>Chapter 3 - Gravitation>Assignment>Q 33

The following figure shows three identical blocks of wood floating in three different liquids $A$ , $B$ and $C$ of densities $d_{1}, d_{2} and d_{3}$ respectively. Which of these has the highest density? Give reason to justify your answer.