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Selina solutions
Grade 9 
Physics
Selina Solutions CONCISE subject class 9-ICSE-Physics
Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation
Exercise 5B
Question 30
Physics
Selina Solutions CONCISE subject class 9-ICSE-Physics
Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation
Exercise 5B
Question 30
Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation | Exercise 5B
Question 30
CHAPTERS
1. Chapter 1 – Measurements and Experimentation
2. Chapter 2 Motion In One Dimension
4. Chapter 4 Pressure In Fluids And Atmospheric Pressure
5. Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation
7. Chapter 7 Reflection Of Light
8. Chapter 8 Propogation Of Sound Waves
A body weighs 20gf in air and 18 gf in water. Calculate relative density of the material of
the body
Weight of the body in the air, W1 = 20gf
Weight of the body in water, W2 = 18gf
We know that, R.D of solid =
W1/W1−W2 x relative density of water
\begin{aligned} &=\frac{20}{20-18} \times 1\\ &\text { [R.D. of water is } 1]\\ &=10 \end{aligned}
Question 30
A body weighs 20gf in air and 18 gf in water. Calculate relative density of the material of
the body
Weight of the body in the air, W1 = 20gf
Weight of the body in water, W2 = 18gf
We know that, R.D of solid =
W1/W1−W2 x relative density of water
\begin{aligned} &=\frac{20}{20-18} \times 1\\ &\text { [R.D. of water is } 1]\\ &=10 \end{aligned}
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