Selina Solutions Class 9 Physics Solutions for Exercise 4A in Chapter 4 - Chapter 4 Pressure In Fluids And Atmospheric Pressure

Question 39 Exercise 4A

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.

Answer:

(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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Exercises

Exercise 4A

Exercise 4B

Chapters

Chapter 1 – Measurements and Experimentation

Chapter 2 Motion In One Dimension

Chapter 3 Laws Of Motion

Chapter 4 Pressure In Fluids And Atmospheric Pressure

Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation

Chapter 6 Heat And Energy

Chapter 7 Reflection Of Light

Chapter 8 Propogation Of Sound Waves

Chapter 9 Current Electricity

Chapter 10 Magnetism