Short / Long Question's Answer | Fluid Dynamics

Short Questions:

1) Machine parts are jammed in cold day, why? 
2) During certain windstorm, light roofs are blown off, why? 
3) Why do bigger air bubbles rise faster than the smaller ones in boiling water? 
4) Why does a flag flutter on the strong wind?
5) Define Viscosity. Does it depend on temperature?



Long Questions: 

1) Derive Bernoulli’s equation from the work-energy theorem. Explain why the equation is valid only for steady, non-viscous and incompressible fluid.
2) Explain why a sphere falling through a viscous medium acquires a terminal velocity. Derive an expression for it. 
3) What is viscosity? Obtain the expression of viscous force from Newton’s laws for viscosity. 
4) State stoke’s law and deduce it from the dimensional analysis. Define coefficient of viscosity of a liquid. 
5) Using dimensional Consideration, deduce Poiseulle’s Formula for the rate of flow of a liquid through a capillary tube.


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