Diameter Definition and 508 Threads

Homework Statement I've been stuck on this problem for a while now, and have tried it several different ways, but with no results. I'm sure I'm missing something obvious or simply approaching it from the wrong direction. The moon subtends an angle of 0.5 degrees at the objective lens of a...

Hello, I am trying to figure out how to calculate the diameter of an orifice for a pill loop in an oil heater and pump. The hot oil is used to heat fuel in a heat exchanger, and is driven by a positive displacement pump. There is a spill loop with an orifice plate, and the requirement is...

"Calculate the initial diameter of a wire that has been longitudinally strained by 30% and whose final diameter is 0.1cm. Assume no volume change." Now I know that if there is no volume change, v=poisson's ratio= 0.5. Thus the lateral strain would equal 30%*0.5= 15%. But when I plug it...

I found this to be quite interesting. continued http://news.yahoo.com/s/afp/20070705/sc_afp/germanyscience_070705151649

Can anybody tell me the accepted figure for the diameter of the universe? I rather thought it was a simple 27 billion light years, but have also picked up on the larger number of 93 billion light years due to expansion. Can you also give me some indication of how robust any estimate might be...

Hi, I have been atempting this is a question for a week now and I've been struggling on the final part. The question is below in bold. The tension in a flat belt pulley is 1250N when stationary. Calculate the tension in each side, and the power transmitted, when the belt is on the point of...

Imagine a pipe of d=50mm with water flowing through. The pipe's diameter is reduced along a small section to 40, and then returned to 50. If I have a flow of x l/s along the first 50mm piece, will I also get x l/s along and after the reduction? Will the only change be more speed through the...

Homework Statement balloons are required to lift 20 metric tons. the pressure of helium is 101.325kpa. temp=21.1degcelsius. what should be the diameter of the balloon if it was spherical in shape in order to lift the weight? Homework Equations bouyant force?? The Attempt at...

Homework Statement The inside diameters of the larger portions of the horizontal pipe in Figure P9.40 are 2.80 cm. Water flows to the right at a rate of 2.00 10-4 m3/s. Determine the inside diameter of the constriction. Answer in (cm) Here is the picture...

1. The radius of Earth is 6.40 x 10³ km. The moon is about 3.84 x 10^5 km away from Earth and has a diameter of 3475 km. The Pacific Ocean surface, which can be considered a convex mirror, forms a virtual image of the moon. What is the diameter of that image?2. 1/p + 1/q = 1/f M = h'/h = -q/p...

i am looking for the equation for angular diameter in relation to an objects distance and diameter. i need it expressed in arc seconds, not radians. anyone know it?

Hi Does anyone know how changing the diameter of the conducting disc used in Faraday's disc (a homopolar generator) would affect the current and voltage induced in the disc. e.g. would a disc with a greater diameter produce a greater current and voltage than that of a disc with a smaller...

Hello, I am new to this forum. I read the thread about the water flow in a rectangular tube because I wanted to correlate what was being said into my own problem. My question I believe is very simple: I have a rectangular tube that has inner dividers, let's say that my tube has 6...

Homework Statement A circle has 300 bases around it..each base being .36nm apart. What is the diameter in micrometers? Homework Equations C = pie x diameter The Attempt at a Solution .36nm x 300 bases = 108nm is the circumference 108nm = pie x diameter 108nm / pie = 34.4nm...

I just want to clarify. A tapped hole is basically a hole that has been threaded for a bolt. Is this correct? So would a tapped M6 hole be 6mm in diameter for a 6mm diameter bolt? Cheers

Homework Statement A glass block 3cm thick and of index of refraction 1.5 is placed on a luminous point. Find the smallest diameter of an opaque object which will prevent any light from passing out of the top of the block. Homework Equations Snell's Law The Attempt at a Solution...

Homework Statement The Lyman alpha radiation for hydrogen (nf=2, ni=1) has a wavelength of 1216 angstroms. Using the simplified model of an infinite 1D potential well, derive an estimate of the diameter of the hydrogen atom. How does this value compare with twice the Bohr radius...

need some help please :) Had major paper due today, didn't have much time for my physics hw, and now I am stumped on some. Anyone got ideas, I have to turn it in tommorow! Thanks for any help you can give! 1. A microscope has an objective lens with a focal length of 16.22mm and an eyepiece...

Diameter of disk? Question: Consider a flywheel made of iron, with a density of 7800 , in the shape of a uniform disk with a thickness of 12.4 . What would the diameter of such a disk need to be if it is to store an amount of kinetic energy of 14.6 when spinning at an angular velocity of 91.0...

the moon subtends an angle of 9.06 x 10^-3 radians amd os 3.84 x 10^8 meters from the earth. What is the approximate diameter of the moon. so i think it has something to do with formula R=S/theta but I'm not sure how to compare the moon and the Earth information to find the diameter of the...

You need to design a 0.9 A fuse that "blows" if the current exceeds 0.9 A. The fuse material in your stockroom melts at a current density of 540 A/cm2. What diameter wire of this material will do the job? 540x10^-2=5.40 A/m^2 5.40= .9/x Solving for x gives the answer: .166666666666667...

Hello I'm wondering if anyone can help me out on a question.I have a mold it is 7 7/8" cylinder (inside diameter) I need to get the measurements for 3 plys of veneer they are 1/16" thick. Thanks

Hey all, I realize that when weight is moved from the center of a flywheel toward the outer edge (or a larger diameter wheel is used), the capacity for energy storage increases. But I have no idea how to calculate how much that increase actually is, or whether the increase remains constant...

A piece of nylon rope used by a mountaineer extended by 1.5 m when carrying the load of the 80 kg mountaineer. If the total length of the rope is 50 m and its diameter is 10 mm, determine the Young’s of this material. If the Poisson’s ratio of nylon is 0.1, determine the change in the diameter...

a perfectly-circular pizza comes in a square box with a card in the box. the card measures 140mm by 70 mm. what is the diameter of the pizza? i tried similar squares but this did not work? any help anyone

what formula should i use to calculate the shaft diameter according to the load due to bending and torsion??

Circumference-Diameter Ration of a circle. x=ox ciram. x diam. ciram. x rad. Determine at least two differenct methods of making the measurements. Be sure you include ways to measure the circumference of the cylinder in each method. Keep in mind that you must measure eah quantity...

Do anybody have any informations on the flux of sand filter system?Varying flux in varying diameter?

Two chords of a circle, AB and CD, intersect at X, such that AX=BX= 6 cm. CX=4 cm and DX=9 cm. Calculate the radius of the circle, given that it has an integer value. I constructed a secant EG of a diameter FG of the circle and drew a tangent from C to it at E, then we have from the intersecting...

could someone please leed me in the right direction for calculating an atoms atomic mass given the diameter of its nucleus? thanks

How do you get the diameter of a circle from the area alone? Can this be done?

Hello everyone, today our professor did this homework problem for us, just different numbers. This is the question: You produce an image of the Sun on a screen, using a thin lens whose focal length is 20.6 cm. What is the diameter of the image? (The mean radius of the Sun is 6.96x10^8 m and...

Hello and thanks in advance for any help you can offer. I really appreciate it. I am learning about tides and having some trouble here: “What would be the effect on the Earth’s tides if the diameter of the Earth were very much larger than it is? What would be the effect if the Earth were as...

"diameter" of universe Can anyone explain how estimates of the diameter of universe are as high as something like 50 billion light-years while the age is about 12-13 billion light years (13 x 2 would seem to give diameter of 26)? Is this a function of the fact that the universe (especially...

Is this true? (excerpted from http://www.astro.uni-bonn.de/~bertoldi/ub313/" about 2003 UB313) "...Its very elongated orbit takes it up to 97 times farther from the Sun than is the Earth - almost twice as far as the most distant point of Pluto's orbit – so that it takes twice as long as...

Using normal 1.5mm diameter bike brake cable, what would be the smallest possible pulley i could use to make a 180 degree direction change with the cable without kinking or distorting the cable?/? Any help with this would be VERY helpful! Thanks!

I need help getting started on this. Question: An iron bolt is used to connect two iron plates together. The bolt must withstand shear forces up to about 3200 N. Calculate the minimum diameter for the bolt, based on a saftey factor of 6.0. Here is what I know so far. Shear Strength is 170...

This is a multiple choice question The fundamental frequency of a small diameter organ pipe is a) directly proportional to its length b) inversely proportional to its length c) independent of its length d) inversely proportional to its diameter e) directly proportional to its...

Hi everybody, My question is: how do we prove that the ratio of a circle's circumference to its diameter is a certain real number, the same for any circle (which we call pi)? If the proof is difficult to post, could you suggest some books that may include it because i haven't found one yet...

A spherical air bubble originating from a scuba diver at a depth of 18 m has a diameter of 1 cm. What will the bubble's diameter be when it reaches the surface? (Assume constant temp) a. 0.7 cm b. 1 cm c. 1.4 cm d. 1.7 cm I know this problem shouldn't be all that difficult, but I'm not...

Intelligent beings on the plantet Xeno have developed a unit of distance called the xen. The number of square xens in the surface area of Xeno is exactly the number of cubic zens in its volume. If Xeno is a spherical planet with a diameter of 2160 Kms, how many km are there in one Xen...

How can you find the diameter of a tube without measuring it? Is there a equation or something or any method other than measuring it

Hi All, I am trying to get a interference pattern from normal daylight and was wonder if I used a VERY FINE pinhole (micron sizes) to concentrate the light into some coherence and THEN have the double-slit plate behind the pinhole plate if this would work. How do I calculate the...

[FONT=Arial][B]You have a 12 volt car battery and a supply of #18 gauge copper wire. If you make a solenoid 30cm long and 8cm in diameter, winding two layers of wire along the length of the solenoid, what will be the strength of the magnetic field at teh center of teh solenoid when connected to...

I'm still very confused to some extent. I know that from QM, an electron, due to Heisenbergs UP can't be measured definitely. It is following Schrödingers equation, and is presented as a vector in Hilbert space ,i.e. in a "electron cloud" of propability. But here my theory is incomplete...

a) what is the diameter of a steel wire 18m long that elongates 9mm when a load of 380kg is hung on its end? b) if the elastic limit is 3.00E8 N/m^2, does permanent deformtion occur? a. \Delta L=FL/YA 9E-3m=\frac{3724N*18m}{20E10N/m^2*A} A=3.724E-5m^2 diameter=6.8859mm b. stress=F/A...

Check please Eqn of Circle with diameter end points(1,2) and (3,-6) Find the equation of a circle with a diameter that has end points P(1,2) and Q(3,-6) I know the equation for a circle in general form is x^2+y^2=r^2 First I found the distance between the two points given because this...

how can I calculate the "diameter" of a spiral ? someone told me i need to use Differential or Integral Equations to solve this, but I'm not sure how. If there is a spiral that it's radius increases by 1 cm for every radian until the radius reaches the size R . how can I calculate the...

This one is confusing me: -----The yield strength of a material is the largest stress a material can support without permanently elongating (like a slinky stretched too far). A brass wire 2.10m long is to support a 176.00N "Eat At Joe's" sign without permanently elongating. The wire...

A disk 8.0 cm in diameter is initially at rest. A small dot is painted on the edge of the disk. The disk accelerates at 600rad/s^2 for .5s, then coasts at a steady angular velocity for another .5s. What is the speed of the dot at t = 1 s? Through how many revolutions has it turned? I...