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The whole point of lubrication is to keep the two surfaces almost apart. Water has low viscosity in comparison to oil-based lubricants, which means that it forms a thinner film (electrohydrodynamic ...

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There are two methods to test flexural strength, three point and four point method. Three point method: and the corresponding moment line: four point load: and its moment line: The maximum ...

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The cold air has a higher density so it always settles down, by installing the AC on top, the cold air can interact faster with hotter air, so the cooling process is much faster. If you install the ...

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There are tons of advantages and disadvantages, but I will mention only the relevant cons and pros. Indirect (belt) drive usually produces less noise in comparison to direct drive (continue power ...

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This is a statically indeterminate problem. I don't know what exactly you mean by moments develop at the fixed supports But I guess you mean if there exist any non-zero components of moment at the ...

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There exist three types of axial plunger pumps. 1- Rotating swash plate axiale plunger piston pumps: Usually for low-power systems, as the temperature rises above 120° C, it can degrade the fluid ...

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You have done everything right! You calculated the polar moment of inertia $J$, which is the sum of second moment of areas $I_i$. But here you have a symmetric object so: $$J = I_x+I_y$$ and $$I_x=... View answer 1 answers 0 votes 111 views 2 votes The coordinate transformation of polar to cartesian is given by:$$\begin{pmatrix} r \\ \theta \end{pmatrix} = \begin{pmatrix} \cos\theta & \sin\theta \\ -\sin\theta & \cos\theta \end{pmatrix}...

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There are multiple ways to solve this problem but I use the moment equilibrium around the points A and B. $$A_y 3l-q_0 4l^2=0$$ You can find the $A_y$ reaction force from the equation above and use ...

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Step one: Choose a right handed coordinate system. As you can see in my schematic: The $X$ axis lies along the beam: So, in $ZX$ plane, the counterclockwise moment is positive. Step 2: ...

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I try to tackel the problem in two different ways, as suggested in the comments. The first approach is based on Bernoulli beam theory, a set of differential equations, (if you want to know how drive ...

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The steady state refers to any phenomenon that is independent of time. Mathematically it means: $$\frac{\partial v}{\partial t} =0$$. Here is an example: Consider a fixed point in the atmosphere ...

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The resultant of distributed loads always acts on the centroid of the distributed load geometry, here the distributed load is uniform so its centroid lies half the way. If the distributed load varies ...

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Yes, in material engineering they call it Thermography. By Radiating heat on the surface or infrared radiation we can map the temperature distribution. The heat transport throughout the material is ...

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Before start to solve the problem, i like to use your assumption about load distribution. And i assume you found the static coefficient of friction. Notice there is a difference between static and ...

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A phase can be defined as as a homogeneous portion of a system that has uniform physical and chemical characteristics, so every pure material. grain is defined as an individual crystal in a ...

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The point is to promote the condition of brittle fracture. The notch here acts as a stress riser and favours the crack propagation. This test is designed for any material, if you already know that ...

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The first option is Oldham coupling, you say ' I have less than a cubic centimetre of space between the shafts in which to place the coupling mechanism.', so i recommend Oldham coupling. They require ...

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The tensile strength is diameter dependent. How greater the diameter, how longer it takes to discharge the heat, so, the time it takes to cool down the material (here is steel) has an impact on the ...

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If you already know the explicit form of the function $f(x)$, then it's possible to find the periode by solving this equation $f(x) = f(x+P)$. If you have a graphical representation of the function (...

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The reason is to prevent instability. What is instability? Let's have look at a simple shaft-journal bearing system. Here is an ideal system wherein a shaft is rotating clockwise inside a journal ...

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It’s difficult to say when we should select the rolling element bearing or the other one, sometimes we have to consider the upsides and downsides of each to decide. Also the working condition and the ...

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The $\frac{4}{s}$ is a current source so it's open when you calculate the Thévenin equivalent, so no current flows thorough the 3 Ohm resistor however $\frac{12}{s}$ is a voltage source so it's a ...

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Those short parallel lines have absolutely no meaning in terms of information relating to the part, but we put them on the drawing to identify the line of symmetry. They are always at the right angles ...

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I'm trying to approach the problem at the high school level. The vertical force is proportional to the tangential force acting at the other end of the rod, the ratio of these two is called the ...

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The results of twist angle is indeed dimensionless, but so are radians! The radian is defined as the ratio of arc length to radius length, so both arc length and radius length have the same unit, ...

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The results are correct and not contradictory at all, but the way you interpret the problems is not totally correct. For mass or impulse balance, you have to first define a control volume. I define ...

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Sort of. When you resolve a vector into its component, you have to choose a coordinate system, resolving the vectors into components is the same as projecting the original vector on the coordinate ...

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