Answer:
μ ≈ 0.408
Explanation:
The coefficient of friction is the ratio of friction force to normal force. The normal force is ...
F = mg = (2500 kg)(9.8 m/s²) = 24.5 kN
Then the coefficient of friction (μ) is ...
μ = (10 kN)/(24.5 kN) ≈ 0.408
Answer:
Differential analysis is used when it is needed to determine the detail information of the flow i.e. pressure or stress variation along any point.
Explanation:
In fluid mechanics, sometime situation arise in which we need to determine in detail about flow characteristics like stress and pressure variation.
To find these flow characteristics some relationship need to imply either at a point or at very small volume and analysis of flow at very small point is known as differential analysis.
Example: pressure and shear stress variation in a line of the wing of a plane.
Explanation:
A material can convert from ductile into brittle material by following reasons
1.At low temperature
2.Due to notches present in materials
When temperature is very low then a ductile material starts to behave like brittle material and it leads to failure of the material.
When material consists large number of notches then it losses it ductility and behave like brittle materials.
During the world war second ships are failed because temperature of sea became to low and due to this steel (ductile material) converted into brittle material and failed without giving any warning.
Answer:
(d) all of the above
Explanation:
before cutting the screw threads the operator should lubricate all of the machine parts given in the option that is lead screw and gearbox , the ways and the cross slide and the carriage and half-nuts. we should use lubrication because it reduces the overall system friction and if friction is reduced then heat generated due to friction is also decreases which is beneficial
so option (D) will be correct because we need lubricate in all the given parts