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Selina solutions
Grade 9 
Physics
Selina Solutions CONCISE subject class 9-ICSE-Physics
Chapter 4 Pressure In Fluids And Atmospheric Pressure
Exercise 4A
Question 39
Physics
Selina Solutions CONCISE subject class 9-ICSE-Physics
Chapter 4 Pressure In Fluids And Atmospheric Pressure
Exercise 4A
Question 39
Chapter 4 Pressure In Fluids And Atmospheric Pressure | Exercise 4A
Question 39
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 iron of mass 7.5kg and of dimensions 12cm x 8cm x 10cm is kept on a tabletop on its base of side 12cm x 8cm. Calculate (a) thrust and (b) pressure exerted on the tabletop. Take 1kgf = 10N.
(a) To calculate thrust
Force = mass x acceleration due to gravity
= 7.5 x 10
= 75N
Area of the base = 12 x 8 = 96 \mathrm{cm}^{2} \text { or } 0.0096 \mathrm{m}^{2}
(b) To calculate pressure exerted
Pressure = thrust/area
= 75/0.0096
= 7182.5 Pa
Question 39
A block of iron of mass 7.5kg and of dimensions 12cm x 8cm x 10cm is kept on a tabletop on its base of side 12cm x 8cm. Calculate (a) thrust and (b) pressure exerted on the tabletop. Take 1kgf = 10N.
(a) To calculate thrust
Force = mass x acceleration due to gravity
= 7.5 x 10
= 75N
Area of the base = 12 x 8 = 96 \mathrm{cm}^{2} \text { or } 0.0096 \mathrm{m}^{2}
(b) To calculate pressure exerted
Pressure = thrust/area
= 75/0.0096
= 7182.5 Pa
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