In this post, I am sharing FSC **1st Year Physics Chapter 6 Solved Exercise **& Numericals Notes PDF for the students of **FSC Part 1**. This is the 6th chapter from the 11th Physics Textbook and its name is Fluid Dynamics. Students can download the **11th Class Physics Chapter 6 Fluid Dynamics Solved Exercise** & Numericals Notes PDF on their laptop or mobile to read it offline. These **Physics Notes for class 11** are for all the boards working under Punjab Board like Gujranwala Board, Lahore Board, Faisalabad Board, Multan Board, Rawalpindi Board, Sargodha Board, DG Kahn Board, and Sahiwal Board. Here are the complete FSC 1st Year Physics Notes PDF chapter-wise.

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## FSC Part 1 Physics Chapter 6 Fluid Dynamics Solved Exercise & Numericals Notes PDF Download

### Certain globular protein particle has a density of 1246kgm^{-3}. It falls through pure water with a terminal speed of 3.0 cmh^{-1}. Find the radius of the particle.

solution:

data:

the density of protein particle p = 1246kgm-3

coefficient of viscosity = 8.0 x 10^{-4} Nms^{-3}

= 3.0 x 10^{2}/ 3600 ms^{-1}

V_{i }= 8.3 x 10 ^{-6 }ms^{-1}

To find: radius r = ?

calculation :

as the expression of the terminal viscosity of the particle is

vi = 2gr2p / 9n

r2 = vi x 9n/2gp

substituting the value in the equation we get

r^{2} 0.02447 x 10^{-10} = 2.447 x 10^{-6}

r = 1.6 x 10 ^{-6 }m

### what flow through a hose, whose internal diameter is 1cm at a speed of 1ms^{-1}. What should be the diameter of the nozzle if the water is to emerge at 21 ms^{-1 }?

Solution:

Data:

internal diameter of hose = d_{1 }= 1cm = 10^{2}m

speed of water in the hose v_{1 }= 1m/s

speed of emerging water v_{2 }= 21m/s

diameter of nozzle = d_{2 }= ?

to find:

as the equation of continuity is:

A_{1}v_{1 }= A_{2}v_{2}

V_{1}(p_{1}^{2}) – V_{2}(p_{2}^{2})

= V_{2 }(d_{2}/2)^{2}

v_{1}d_{1}^{2} = v_{2}d_{2}^{2}

d_{2}^{2} = 1/21 x (10^{-2})^{2 }= 0.0476 x 10^{-4 }d_{2 } = 0.22 sm ans

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