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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 5C
Question 13
Physics
Selina Solutions CONCISE subject class 9-ICSE-Physics
Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation
Exercise 5C
Question 13
Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation | Exercise 5C
Question 13
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 block of wood is so loaded that it just floats in the water at room temperature. What change will occur in the state of floatation, if
(a) Some salt is added to water,
(b) Water is heated
(a) It floats with some part outside water.
The density of water increases when salt is added to water, so the upthrust on the block of wood increases, and therefore, the block rises up till the weight of salty water displaced by the submerged part of the block becomes equal to the weight of the block.
(b) It sinks.
The density of water decreases on heating, hence the upthrust on the block decreases, and the weight of the block exceeds the upthrust as a result of which it sinks
Question 13
A block of wood is so loaded that it just floats in the water at room temperature. What change will occur in the state of floatation, if
(a) Some salt is added to water,
(b) Water is heated
(a) It floats with some part outside water.
The density of water increases when salt is added to water, so the upthrust on the block of wood increases, and therefore, the block rises up till the weight of salty water displaced by the submerged part of the block becomes equal to the weight of the block.
(b) It sinks.
The density of water decreases on heating, hence the upthrust on the block decreases, and the weight of the block exceeds the upthrust as a result of which it sinks
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