Diameter Definition and 508 Threads

What is "nominal Conductor diameter"(in generator winding)?

Hi All, I am designing a hollow rotating drum equipment which will be filled with specialized media for wastewater purification. I need help to design the shaft diameter for the entire assembly. The Drum will be hollow with a diameter of 1.77 meter and length of 2.5 filled with some kind of...

A pipe with a circular cross-section area has the inner diameter of 28 mm. How big should the pipe's outer diameter be, if the cross section area of the pipe's wall is 4.5 cm2? I have been trying to solve this for ages, but failed so far... Can someone help?

Homework Statement A mild steel bar 40 mm diameter and 100 mm long is subjected to a tensile force along its axis. Young’s modulus of elasticity for mild steel = 200 GN m–2. Poisson’s ratio is 0.3. Calculate the force (F) required to reduce the diameter to 39.99 mm. Use the x–y coordinate...

I was under the impression that one of the ways of representing a black body (for explaining the ultraviolet catastrophe) is as a 'resonant box'. Frequencies lower than the dimensions of the box cannot be contained within and the black body is thus 'transparent' to those frequencies of light...

Hi all, This is probably a silly questions, but I want to be sure :). I'm wondering if a real image, created by a convex lens, can appear larger than the lens diameter itself. As an example, I'm thinking about the following: - I have a an object of height h_0=7.76" (display size of...

I have a hose that temporarily stores pressure in it, and it is about 19.05mm (3/4 inch). The outlet diameter is 8mm, so the air is squeezing into an area ~0.4 times the size. Does this increase the air flow speed, or the pressure? Does it follow a rule similar to: P1*V1 = P2*V2 except...

Homework Statement Mild steel bar 40 mm diameter and 100 mm long, subjected to a tensile force along its axis (through central length) Youngs Modulus = 200GN m^-2 Poisson's ratio = 0.3 Calculate the force required to reduce the diameter to 39.99mm (there is also a picture saying Use...

Homework Statement The solid shaft is made from brass that has an allowable shear stress = 100 MPa and a shear modulus of elasticity G = 39 GPa. The length of the shaft is L = 2 m, and over the length of the shaft the allowable angle of twist is θ = 0.10 rad.the shaft is subjected to a...

Hi Please help me to know : if i have a laser beam with 5 millimeter diameter that reduced to 0.5 millimeter diameter with a lens, Can i reduced the 0.5 millimeter diameter beam to 0.05 or less that 0.5 with another the same lens...

Freight train is more efficient than truck due to lower rolling resistance. And I wonder which one has lower rolling resistance, small diameter or larger one or it doesn't not depend on diameter at all? Both are steel wheel on steel rail.

I was reading an article and came across the idea that cosmological measurements of the angular distance diameter could be used to prove that supernova dimming did not occur due to dark energy. However I could not wrap my head around it. Angular distance diameter is giving by: dA = x / θ...

Solids tend to expand when heated or when they transition to a liquid. Is this thermal expansion a factor in the earth? If the diameter/volume increases, this would cause the surface area to increase also. This would lead to cracks, rifts or faults in the crust of the earth. Could this be a...

How does the diameter change from one manometer say of radius x cm to say 2x or 3x cm change the height difference if the liquid in the manometer is of constant mass, density and gravitational field strength remains the same? P.S could some working also be shown just to get a mathematical...

How is this possible if quarks are point particles?

(For recreation) Assuming (from Wikipedia) that the mass of the Sun is 2 x 10^{30} Kg, I wondered what would be the size of an equivalently-massed ideal ball of water at STP with uniform density? I read there the Sun is about 109 Earth diameters. My water ball model calculation is ~123...

I was just reading about how the redshift-relation for angular diameter distance is calculated, and the example in my textbook used a matter-dominated universe to calculate the formula. It seems to rely heavily on the relationships between t, a(t) and H(t), which are different in radiation...

Homework Statement You have a round steel cable with diameter d and a ultimate strenght of 400Mpa. There is a force of 8,2KN working along the cable. What is the smallest possible diameter the cable can have without breaking? Homework Equations δ= N/A Area of a circle: πr^2 The...

Homework Statement Find the diameter of one atom of argon given that Dp = 2 where D is diffusion and p is pressure. The Attempt at a Solution molar mass of argon is 40g/mol using that for one atom can find mass in kgs. but that's its! im not given V, T or p. can put V in terms...

PLEASE LOOK ATTACHMENT! Star mass affects event horizons diameter.But we know that Black hole's foundation is singularity so we can understand that singularity affects event horizon diameter. Example:Imagine there are two stars, first star mass is 5 star mass second one is 7 star mass...

I am reading Richard Feynman's book Vol I. There he tells us how people usually used to find out the distance to some distant objects. I understand triangulation for objects that are near to the Earth or for stars that are near to our solar system. But how did they use the same principle to find...

Find the resolving power of a microscope lens in terms of its diameter Homework Statement In this problem, we will find the ultimate resolving power of a microscope. First of all, in order to obtain a large magnification, we want an objective lens with a very short focal length. Second, in...

Homework Statement Suppose you wish to fabricate a uniform wire from 2.00 g of copper. The wire is to have a resistance of* R = 0.480 Ω*and all the copper is to be used. Homework Equations The Attempt at a Solution In the problem, they suggest using this relationship for...

So, the relationship of resistance is R= \rho \frac{l}{A}; assuming the resistor is cylindrical, the cross-sectional area of the resistor is A = \pi r^2. The relationship between the radius and diameter is r = \frac{d}{2}. Substituting in this relationship, A = \pi (\frac{d}{2})^2 So, if I...

In Rudin we read ##diam \ \bar{S} = diam \ S##. And the ##2ε## trick is very clear. However I see how would this would work for an accumulation point of ##S## but what about an Isolated point of ##S## that is miles away from the set.

Hi guys: I am having trouble with differentiating nominal and major diameter, from what I get on google as well as my textbook, the nominal diameter is the largest diameter in the thread and major diameter is the distance between crest to crest. but aren't the two the same? thanks

Homework Statement A solid is generated by revolving the region bounded by y = x2/2 and y = 2 around the y-axis. A hole, centered along the axis of revolution, is drilled through this solid so that one-fourth of the volume is removed. Find the diameter of the hole.The Attempt at a Solution...

Hey everyone! I am designing an experimental, manned aircraft that uses twin caged propellors for VTOL, and I'm looking for a lightweight, high-output power source to power them. Any ideas?

Homework Statement Consider a stream of water flowing from a kitchen faucet. At the mouth of the faucet, the diameter of the stream is 0.960 cm. The stream fills a 125 cm^3 container in 16.3 seconds. Find the diameter of the stream 13.0 cm below the mouth of the faucet. Homework...

Hello, I'm building some equipment that has a drum driven by a timing belt. The drum is roughly 11.25" in diameter. The drive belt used is H pitch - 1/2" spacing between the teeth. For the gear teeth on the drum I'm using another belt of the same pitch, inverted and epoxied onto the drum. The...

Homework Statement I have a wire of some resistance, resistivity, and length. What is the maximum error in measuring the diameter that you can have if the resistance is to have 1% uncertainty? Homework Equations R = \frac{ρ*l}{\pi*r^{2}} for which I substituted the area as \pi(.5...

Homework Statement We're given two solenoids with identical currents and turns per unit length. But the solenoids have different diameters. Would a metal BB experience a larger acceleration in the smaller diameter tube, assuming we use the same BB in both solenoids it accelerates along the...

I am a little confused about the pressure and hose diameter relationship. Let's say I have a pump pumping at a given pressure; I connect a hose of a certain diameter and attach a pressure gauge to the other end of the hose and get a pressure reading. Now let's say if i conduct the same...

A Cable that has a yield strength of 620 MPa and a safety factor of 3. This cable must be able to support 5 buckets which must be able to carry up 5,429.554 kg each. Bucket mass is negligible. Stress = Mass/Area Area = force/stress My attempt at a solution: Total weight 5 buckets must...

Homework Statement Points A B and C lie on the circumference of a circle where $$A =(-3,2)\\B=(-1,6)\\C=(7,2)$$ Show that AC is the diameter of the circle. Homework Equations The Attempt at a Solution Would it be sufficient to show that the angle ABC is a right angle and therefore...

Homework Statement Water flows in a pipe with speed 1.5 m/s at point 1. The diameter of the pipe at point 1 is 4cm and the diameter at point 2 is 3cm. density of water: 998.2071 kg/m^3 What's the speed of the water at point 2? Homework Equations I think you need to use this. I just have no...

Assume that the average distance of the sun from the Earth is 400 times the average distance of the moon from the earth. Now consider a total eclipse of the sun and state conclusions that can be drawn about: A. The relation between the sun's diameter and the moon's diameter. B. The relative...

So I got to see an amazing Moon Halo the other night. My question is, what is really the diameter of the average location in the halo, where the light is bent by ice crystals? Is it really as easy as doing the trig with the altitude to your average cirrus cloud, the angle above the horizon...

Question for the brilliant minds around here: I'm trying to figure the amount of torque (I*a) needed to rotate a cylinder of a given mass, diameter and length around a pivot point that is off-center. Typically I'm assuming I would find it out by calculating both I for central diameter and end...

A small rocket powered by high-pressure nitrogen (R = 1776 ft-lb/slug/R, gamma=1.4) is used as an attitude control device. In space, the thrust of a rocket is given by T =mVe in lbf. Find the thrust and exit diameter of this rocket with a throat diameter of 1.0 inch if it operates at PT =...

Homework Statement The windings of high-current electromagnets are often made of copper pipe. The current flows in the walls of the pipe, and the cooling water flows in the interior of the pipe. Suppose the copper pipe has an outside diameter of 0.8 cm and inside diameter of 0.5 cm...

Homework Statement A car is moving at a speed of 20 m/s in 4 seconds and the car's tire is 38cm which is its diameter. How many revolutions did your tires make? Homework Equations Relevant Equations, T=2∏r / v The Attempt at a Solution My attempt at a solution: To get...

Homework Statement What diameter must a copper wire have if its resistance is to be the same as that of an equal length of aluminum wire with diameter 3.94mm? Give your answer in mmHomework Equations R = ρL/A where A is the cross sectional area, L is the length and ρ resistance of the...

What exactly is the benefit of having the accounting servers in another location than the authentication/authorization servers?

Hi guys Have lurked the forums for a while but this is my first contribution. I am in first year physics at uni and I was having a discussion with my tutor regarding the relative error for an experiment (circular motion / moment of inertia). (I tried searching for an answer to this with no...

Homework Statement Hello! I have a problem where I need to develop and justify a hypothesis surrounding the relationship between the thickness (or diameter) of a nichrome wire and the temperature of water that it's submersed in over a time of 5 minutes. (proportionality statement and...

Homework Statement A 54.0kg cheerleader uses an oil-filled hydraulic lift to hold four 120kg football players at a height of 1.30m . If her piston is 19.0cm in diameter, what is the diameter of the football players' piston? Homework Equations I think the only equation needed is...

I attached the file. I just wanted to clarify something. All i need to find is the density @ inlet&outlet and the diameter at the outlet. The heat loss they have shown has no impact on the values that were asked for right? density can be found by pressure/(RT) where R=gas constant...

Homework Statement Water pumped to a cooling plant through a 4km long cast iron pipeline. power available is 30kW. what pipe diameter is required to ensure a mass flow rate of 100kg/s. Homework Equations The Attempt at a Solution I know you have to guess a value and find it...

I'm trying to find a silver chain that can be used for a small bead with a small hole. Obviously, the chain needs to be thin enough to fit through the hole, but I can't measure the hole inside the bead by hand. I found a chain that is 0.9mm in diameter, but I'm not sure the bead will fit. So...