- 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
Selina Solutions Class 9 Physics Solutions for Exercise 4A in Chapter 4 - Chapter 4 Pressure In Fluids And Atmospheric Pressure
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(a) Calculate the height of a water column which will exert on its base the same pressure as the 70cm column of mercury. The density of mercury is 13.6 g cm^{-3} .
(b) Will the height of the water column in part (a) change if the cross-section of the water column is made wider?
(a) We know that the pressure exerted by the water column, P = h ρ g
The density of water = 1
As the pressure of water and mercury is the same,
\begin{array}{l} h_{w} \rho_{w} g=h_{m} \rho_{m} g \\ h_{w} \times 1 \times g=h_{m} \rho_{m} g \\ h_{w}=h_{m} \rho_{m} \\ \quad=\frac{70}{100} \times 13.6 \end{array}
Height of the water column= 9.52m
(b) If the water column is made wider, the height of the water column will be unaffected.
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