Diameter Definition and 508 Threads

I'm a bit rusty on partial uniform loading on a pin. I want to find the minimum diameter a cold rolled steel pin has to be using a factor of safety of 2 with a loading of 25000 lbs. The pin in the picture is welded between two plates (the right plate bends in and is welded to the left plate...

Hello everybody, It is normally said that fluid flow in a larger diameter pipe is easier (less energy losses) than in a smaller diameter pipe. This indeed appears to be true in relatively high flowrate applications however, I'm struggling to understand why drinking from a normal straw (small...

Hey guys.. Sorry for my english, i'am only 16 and it's not my parent language. I need help about a problem on mechanical engineering, and i really appreciated if you can help me out. I assume that I've got a moter currents which gives me out 220-230 Volt trend, and has 1800 bends per minute. Now...

Hello all, I am 100% untrained in even reading about spring making let alone making them. There's a project I want to complete though and I need to make some props involving them. I say these conical springs would be roughly the diameter of a basketball to start with (9.55") and cone to a...

If you divided the circumference of an infinitely large circle by its diameter, would the result be pi?

Guys...need a little help Given Internal fluid Pressure P (Not Pressure Drop) flow rate Q Length Assume all the required parameters like viscosity, fluid density, temperature of the fluid, surface roughness and all losses (both major and minor) etc... I need to find the internal diameter of...

I didn't know where to put this, I figured I'd start here since this area sees traffic that other areas might not see. Someone can move it if there's a better section for it. I'm thinking of an instrument design that has a light path as follows: UV-Vis light source, monochromator or filter that...

Hi I one of my application i am using the lead screw arrangement to lift 200kg weight using handle I used trapezoidal thread and nut. Could anybody suggest the diameter required for lifting the weight of 200kg

Homework Statement Power=P, rotation speed n1, rotation speed n2, chain center distance c, life = Lh All I need for this one is the formula for sprocket diameter. I have found calculators (https://www.rbracing-rsr.com/calcsprocketdiam.html) but no reference to the formula. Chain pitch and...

Most of the problems I've worked on involve wires of small radii, however, if DC current flows within large radii of conductive wires, would I need to use current density ##J## for calculating the magnetic field at a point ## r > R## instead of ##I## if it we're known? With relevance to a wires...

What type of geometry or tool aristarchus used to show that during lunar eclips Earth's diameter is 2.5 times moon's diameter and during solar eclips it tapers one moon diameter, why they add these two to get Earth's diameter as 3.5 times moon's diameter

how aristarchus found that Earth's diameter = 2.5 × moon's diameter . What wrong things he did to calculate the size of moon just like the shodow part.

Q: Estimate the diameter in kpc of the red-shift=6.56 galaxy at the moment when it emitted light. We're assuming that early galaxies with similar red-shifts have the same number of stars to galaxies as in the present state of the universe. I've taken a look at the small angle formula a = s / d...

Homework Statement when we find the diameter of a pipe , we have to found the value of D and f by iteration , how to choose the start value of friction factor when we do the iteration ? Homework EquationsThe Attempt at a Solution

Hello! We are 3 students working on a bachelor thesis rigth now, with the purpose to determine the efficiency for different nozzle designs. We have done several practical tests, where we have logged the water pressure and the flow out from the nozzle, and calculated the nozzle efficiency based...

Homework Statement 1) Calculate the angular diameter distance to the last scattering surface in the following cosmological models: i) Open universe, ΩΛ= 0.65, Ωm = 0.30 ii) Closed universe, ΩΛ = 0.75, Ωm = 0.30 ii) Flat universe, ΩΛ = 0.75, Ωm = 0.25 Describe how the CMB power spectrum...

What was the diameter of the telescope that Charles Messier used to make the Messier Catalog?

Homework Statement why in 4.4 the author gave D =4Rh? in 4.5, D= 2Rh ? Homework EquationsThe Attempt at a Solution

Homework Statement An engineer is planning for a network of pipes to a residential tower containing 360 apartments each one of them consumes 0.05 liters/s of water what is the least possible pipe discharge for the main pipe in the network if the fastest speed of discharge in the pipe is 4m/s...

Homework Statement i was told that the hydraulic diameter = 4Ac / p , while the hydraulic radius = Ac / p , where Ac = cross sectional area , and p = wetted perimeter of the pipe , why shouldn't the hydraulic radius = 2Ac / p ? because as well all know , diameter = 2 Radius , so hydraulic...

Homework Statement a solenoid inductor consists of 200 closely spaced turns, length = diameter = 5cm. calculate inductance. Homework EquationsThe Attempt at a Solution H = NI/L L = N (flux) / I - you can't use this because the length is equal to the diameter. What equation do I use?

The title is explanatory. I know that an iron core yields a stronger electromagnet. What if you have an electromagnet with an extremely tiny air coil relative to its volume? Does the small air coil diameter effect the electromagnet?

Homework Statement Suppose the temperature is 80℃ and we have a soap bubble that has a pressure increase of 40 [Pa]. What is the diameter of the bubble? Homework Equations ΔP=4Y/R The Attempt at a Solution I'm very confused about how to find the coefficient of surface tension (Y). In an...

Homework Statement What is the diameter of a copper sphere that has the same mass as a 9.00 cm× 9.00 cm× 9.00 cm cube of aluminum? Density of Aluminum = P(al) = 2.70g/cm3 Density of Copper = P(cu) = 8.96 g/cm3 Volume of Aluminum Cube = Vcube = 729 cm3 Homework Equations Volume of a Sphere =...

Homework Statement I am doing the old frozen can vs liquid can experiment and one of the questions asks that if cans with different diameters were used with the same contents (so same mass relative to diameter size) how would this effect the time taken for the cans to go down a ramp (how would...

Not sure how to solve considering nothing is given as perpendicular or bisected. Is anyone aware on how to solve this problem? ~S.R.K.

I've never heard or seen it stated this way before, so I'm asking this question just to check my intuition and to see if my understanding is correct: The Planck distance IS the Planck distance PRECISELY BECAUSE its the Schwarzschild Radius (or diameter, I suppose) of a single quantum of energy...

Homework Statement I am trying to find the diameter of two types of pipe in this systemHomework Equations ## \frac{p_1}{y} + \frac{V_1}{2g} + z_1 = \frac{p_2}{γ} + \frac{V_2}{2g} + z_2 + \frac{V_2}{2g} [ \frac{fL}{D} + K ]## The Attempt at a Solution The only flow rate I'm given is the one...

Homework Statement The Galaxy has a black hole with about 3 x 10^6 M☉. What is its diameter in AU? Homework Equations Not sure. The Attempt at a Solution 3,000,000 solar mass, but not sure how to figure out the diameter in AU. Let's see...diameter of the sun is 1,000,000km 3,000,000 x...

I am toying with an idea and not sure if it's feasible. Here is the setup: There is a 6' diameter steel pipe that is 30' long standing up vertically. Inside, among other stuff, are ~20 small 'trolleys' on tracks that run from top to bottom, spread out evenly among the cross sectional area of...

I know that space is expanding, so the further away you go from my location, the faster space is expanding, asymptomatically approaching the speed of light. I also know that as relative velocities approach the speed of light, the length of space contracts. From this I come up with a limit for...

Automobile tires has been gotten smaller, diameter wise over the years. Below were based on Cadillac of different era. 1915 - 51-Eight with 36x4.5 tires with overall dia 36.8" and 4.75" wide 1925 - V63-Eight with 33x5 tires with overall dia 34.88", and 5.88" wide 1936 - V16 with 750x16...

Hi, How can i calculate the blank dia required for a torispherical dish?Please share any formulas if you have.. OD=1332 MM THICKNESS 6MM

Homework Statement Homework Equations I=Q/t The Attempt at a Solution I chose B because since current is equal in both wires, I thought that the rate of charge flow is equal. Isn't that the definition of current?? Apparently I'm wrong since the answer is D. How can this be?

When we see an official description of Pluto's "diameter" it is given without the atmosphere. The official diameters of the gas giants seem to include many layers of gaseous atmosphere. Is this difference merely a convention? Or is there a good reason for treating e.g. Pluto differently than...

New Horizons has found that Pluto is larger than its greatest rival, Eris. Last year, other observations suggested that Pluto was around 1,471 miles across, which would have meant it was bigger than Eris, whose diameter is 1,445 miles. Link: Pluto Regains Its Title as the Largest Object in Its...

Hey everybody, I'm right now trying to solve a question I found in a German physics competition 2006 concerning the diameter of a thin camera lens. I'm not able to find a solution, since there is basically nothing given. Here the task (I underlined phrases which might be important): A ruler...

Was wondering whether a 2 kilometre section of 80mm asbestos water main was replaced with 150mm PVC then rejoined into the last 3 kilometres of old asbestos would it create pressure breaks. The head pressure is 50 metres. Cheers.

http://www.upload.ee/image/4760492/DSC_0002.JPG Homework Statement I have given angle of twist, diameter, uniform load, and length of the beam. I need to find the G.The load gives me some trouble and i don't know if i should solve it by using integration or? :) Homework EquationsThe Attempt...

Mod note: Moved from technical math section, so no template. The diameter of a circle has endpoints P(0,0) and Q(8,-4) Find the equation: First I will find the midpoint: M(x,y)=(x1+x2)/2,(y1+y2)/2 =8/2,-4/2) M(x,y)=(-4,-2) Then I will find the radius: r^2=(x-h)^2+(y-k)^2 r^2=(0-4)^2+(0+2)^2...

Homework Statement Calculate the molecular diameter of hydrogen, assuming the spherical shape on the basis of van der Waals coefficients. Van der Waals Coefficients for hydrogen a = 0.244 atm L2.mol-2 b*103 = 26.6 L.mol-1 Homework...

Hi, I tried to find design regulations/codes that specify relations between bolt diameter/bolt length against connected plate thicknesses. I couldn't find that in Eurocodes 3. Can someone help me with info where to find those regulations ? Example: can we connect 5 mm plates using M24 ? or...

Hello Everyone, I need an animation or video or something that will convey different speeds of different sized circles. Ideally, I would like some type of tire setup that shows a smaller circle driven at the same speed rotating more quickly than a larger circle. I am using this for an...

Hey guys, I am looking at the concept of Reynold's number applying to anesthesia circuits. I understand that one formulation for Reynold's number as it relates to a fluid flowing through a tube of constant dimensions is: R# = (Velocity x Diameter x Density)/Viscocity I know that a high R#...

A awhile ago I wrote a program to calculate various things like maximum resolving power of a given telescope's primary mirror, angular diameter of an object of a given size from a given distance and mirror diameter required to see an object of a given angular diameter. However, I seem to have...

How can we calculate universe dimater at a given time ?

I need to reduce the beam diameter of a laser I am using. I plan to do this by first passing the beam through a positive spherical lens with focal length f1 and then a negative spherical lens with focal length f2 and f2 < f1. By placing the lenses so that the two focal points overlap I will have...

I hope this is just a simple question. You have two bikes, each different wheel diameter. Will the same effort on each bike result in the one with big wheels going faster? The rest of the parameters is not important / the same. Just interested if two people riding on the bikes with two diferent...

Hi, I just confuse how to know this hydraulic diameter, would you mind to help me? hydraulic diameter is for reynold calculation then heat transfer coefficient. Thank you

Homework Statement A 5.02 pF air-filled capacitor with circular parallel plates is to be used in a circuit where it will be subjected to potentials of up to 95 V. The electric field between the plates is to be no greater than 1.40×104 N/C. As an electrical engineer for Live-Wire Electronics...