Bernoulli's principle states that in a steady flow, the sum of pressure, kinetic energy per unit volume, and potential energy per unit volume remains constant.

Are the mechanical properties of fluids important in NEET?

Swayam Gupta

Yes, the Mechanical properties of fluids class 11th physics is important in NEET. On average, 1-2 questions would be asked from this chapter, which you can cover from the Class 11th Mechanical Properties of Fluids notes.

What are the Mechanical properties of fluids?

Swayam Gupta

The main mechanical properties of fluids are exerting pressure, resisting flow or viscosity, forming surface tension, following Bernoulli's principle, and moving in a streamline.

A small spherical ball of radius 0.1mm and density 10⁴kgm^-3 falls freely under gravity through a distance h before entering a tank of water. If, after entering the water the velocity inside water, then the value of h will be_________ m.

(Given g = 10 ms^-2, viscosity of water = 1.0 × 10^-5 N-sm^-2).

Vishal Baghel

Since velocity does not change, so acceleration will be zero.

mg = FB + Fv $\Rightarrow \frac{4 π}{3} r^{3} ρ g = \frac{4 π}{3} r^{3} σ g + 6 π η r v$

$\Rightarrow v = \frac{2 r^{2} (ρ - σ) g}{9 η} = \frac{2 \times 0.1 \times 0.1 \times 1 0^{- 6} \times (1 0^{4} - 1 0^{3}) \times 10}{9 \times 1.0 \times 1 0^{- 5}}$

$\Rightarrow h = \frac{400}{2 g} = 20 m$

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10.8 A hydraulic automobile lift is designed to lift cars with a maximum mass of 3000 kg. The area of cross-section of the piston carrying the load is 425 cm². What maximum pressure would the smaller piston have to bear?

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10.8 A hydraulic automobile lift is designed to lift cars with a maximum mass of 3000 kg. The area of cross-section of the piston carrying the load is 425 cm2. What maximum pressure would the smaller piston have to bear?