What is the correct statement regarding the stress over the section of a shaft in torsion?
1 answer:
Answer:
d) A shear stress that varies linearly over the section.
Explanation:
Given that shaft is under pure torsion
As we know that relationship between shear stress in the shaft and radius given as
For solid shaft
Therefore shear stress given as
T=Applied torque on the shaft
τ=Shear stress at any radius r
From the above equation we can say that shear stress is vaying linearly with the radius of the shaft
Therefore the answer will be d.
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Answer:
If Reynolds number increases the extent of the region around the object that is affected by viscosity decreases.
Explanation:
Reynolds number is an important dimensionless parameter in fluid mechanics.
It is calculated as;
where;
ρ is density
v is velocity
d is diameter
μ is viscosity
All these parameters are important in calculating Reynolds number and understanding of fluid flow over an object.
In aerodynamics, the higher the Reynolds number, the lesser the viscosity plays a role in the flow around the airfoil. As Reynolds number increases, the boundary layer gets thinner, which results in a lower drag. Or simply put, if Reynolds number increases the extent of the region around the object that is affected by viscosity decreases.