Diameter Definition and 508 Threads

Homework Statement Two open tubes both have actual length 1m but their diameters are D=1 cm and D=10 cm. Alowing fro end corrections, what are their fundamental frequencies? Homework Equations the only equation in my book that deals with Diamter is N(Critical...

Ok I'm trying to work out a few things with propellers but I am struggling to work out if I have got this right. If I have an 1800 shp engine running at about 2000 rpm and I want my aircraft to have a maximum speed of approximately 350 mph what is the maximum diameter I can have the...

An object is 9.79 cm from the surface of a reflective spherical Christmas-tree ornament 8.96 cm in diameter. What is the position of the image? Answer in units of cm I know that i need the radius of curvature to find the position of the image, but I'm not sure how to get that from the...

We are on lesson 1 and 2, which are vectors and kinematics only. We haven't covered anything else, yet the professor assigned us this problem. Can anybody help me? I have searched google and have yet to understand this problem. Thank you! To an observer on earth, the moon, which is 3.8x10^5...

"Diameter of a soap bubble increases when it is charged." why?

Hi all, I want to know if impeller diameter of a Blower can influence its suction pipe length. If so, then how are they related?

Homework Statement Hello, I have a question on how to calculate the equivalent/hydraulic diameter for a problem that I'm doing. The problem states that I should use the cross-sectional flow area shown with an equivalent diameter based upon a closed rectangle (entire perimeter)...

Is there any reason to expect both the star formation history and the angular diameter distance to peak at around the same value (redshift ~ 1.6)?

Hi, How to determine a threshold aperture, at which the diffraction begins to limit resolution of the sensor ? Which situation reflects that point: 1) Airy disk diameter / 2 = 2 x pixel pitch http://www.outbackphoto.com/dp_essentials/dp_essentials_02/essay.html" (third pixel detects the...

Hello In an electron diffraction experiment usually the diffraction rings are blurred. My question. If measuring the diameter, should I measure to the inside of the ring, the outside, or take a guess where the middle of the ring is and measure to there? Thanks

I am planning to do a high altitude balloon launch and I was wondering if anyone on this forum could help me figure out a few things. The payload+the balloon+the parachute= weigh around 2 pounds. I am looking to get 3 pounds of free lift (each pound of free lift equals 300 feet per minute...

Homework Statement An aluminium wire has diameter 0.5 mm and resistivity 2.8 X 10-6 Ohm cm. How much lenth of this wire is required to make a 20 Ohm coil? Please tell me how to convert Diameter 0.5mm? what's the procedure? After that I can directly apply- l = RA/rho

Hi, I am stuck with the following proofs. In metric space here, A,B,C are subset of metric space (X,d) and C is bounded Problem 1.) d(A,B) <=d(A,C)+d(B,C)+diam(C) Problem 2.)|d(b,A)-d(c,A)| <= d(b,c) where 'b' belongs to 'B' and 'c' belongs to 'C'. Problem 3)- diam(A U B)<= diam A+...

Homework Statement In a recent high altitude experiment, some physics students used 1500 liter of helium to inflate a latex sounding balloon that would ascend to an altitude of over 30 km. what was the approximate diameter of the (assumed spherical) balloon after inflation? Homework...

I am working on a project that will use cylindrical neo magnets. Is there an ideal height to diameter ratio for neo magnets?

If I know the diameter of a galaxy in the sky is 150 arcseconds, how do I find the angular diameter?

Hi, Can anyone explain (physically) why the angular diameter distance starts to decrease after a certain redshift (around z = 1.5)? Thanks

Does an inside of a wheel spin faster than the outer diameter of the wheel? Isn't this how gears work?

What is the crater size for an asteroid impact as a function of the asteroid diameter? Are there any estimated function?

can anyone say, how much diameter of rotor(disc) is required for locking of all 4 wheels of a 300kg vehicle in an off road?? (approx.) and i heard from technicians that drum brakes can`t lock wheels, is it true??

I am converting some old gas cylinders into chimes. They are empty and have the valves removed. They held inert gas, not fuel gas. They are 8" inside diameter steel cylinders approximatly 5' tall. I wish to cut them to harmonic lengths, but do not remember what I learned in physics regarding...

Hello everyone! I am new here, so I am not sure how things normally work. anyways, on the the problem. I have a ramp made out of channeling, approximately 8 foot long, that i am going to roll spherical objects down. i want to find out the theoretical time it will take. friction doesn't...

Does a particle's diameter affect anything in determining its position, momentum, energy, etc.? Does it play any role in Shrodinger's equation?

current and Ohm's Law--filament diameter Homework Statement A standard 100 W (120 V ) lightbulb contains a 8.50 cm -long tungsten filament. The high-temperature resistivity of tungsten is 9.0*10^-7. Homework Equations Power=I\DeltaV=\Delta^2/R J=I/A The Attempt at a Solution I...

Homework Statement A hollow spherical iron shell floats almost completely submerged in water. The outer diameter is 66.0 cm, and the density of iron is 7.87 g/cm3. Find the inner diameter. Homework Equations Fb=MG 4/3pir^3=Vsphere The Attempt at a Solution Not sure where to...

I have started a home study course in mechanical engineering, I now realize that I should have started with a math’s course but any way I have a question that I could do with some help with. A designer wishes to calculate the thickness (diameter) of a steel cable for suspending a passenger lift...

Hi, I was wondering what is the relationship between 'diameter size' and the strength to flex a hollow tube... is it linear or non-linear? I'm measuring the flexural load of different hollow tubes (with different diameter size) and looking for a way to normalize the the flexural load data...

Homework Statement Suppose you wish to fabricate a uniform wire from a mass m of a metal with density \rhom and resistivity \rho. If the wire is to have a resistance of R and all the metal is to be used, what must be the a)length and b) the diameter of this wire? (Use any variable or symbol...

I am not a physics student however I have a random and hopefully SIMPLE question about wheel diameter over time and distance Basically take a toy car. A Hotwheel 1/64 scale car for example and run a Pine Derby type of event. If a car was released down a slope from height of 5ft, slope 10...

I got to measure the diameter of a marble with a micrometer. Whatever the diameter and the radius be, it doesn't matter here and calculate the volume of the marble I was told to use the formula " V = Square root of (4/3 * 22.7 * rcube)". Then the last question was asked: "Give 1 practical...

Why, in terms of Physics so forces etc... does the diameter of a the splash from a raindrop increase when the height is also increased?:confused: Thanks (:

Homework Statement An observer on the Earth observes the angle subtended by the diameter of the moon to be 0.009199 radians. If the moon is 234,800 miles away, what is its diameter? Homework Equations Egrav= -Gm1m2/r 57 rad=1 deg The Attempt at a Solution Alright this one is really...

Homework Statement Given: diameter 0.8 m height 1.2 m floats in water how far will it sink in a liquid (density =1360 kg/m^3) Homework Equations Buoyant force The Attempt at a Solution In the attachment I'm stuck on how to find the volume of the submerged cone in the...

Homework Statement Calculate the diameter of a meduim carbon steel pin in double shear subjected to a suddenly applied shearing force of 150000N? Homework Equations A=p/t p=300000 ( double shear) t=580 ( ultime shear strength) The Attempt at a Solution Double shear 150000...

Hi there, I am currently doing an upgrade of the drain lines at a power station, the steam temperature (in the section where the drain line is to be installed) is 217*C and it's pressure is 31MPa, I am looking for an ASME or any other code specification that explains how to determine the...

Hello everyone, I m working on a project that I want to create linear motion to carry a load which is constructed eccentricly as you see in the picture. I am looking for the equations about calculating the lineer bearing length and shaft diameter. In this construction, I am using two...

Homework Statement Draw the path of two parallel incident rays in a beam expander composed of two convering thin lens, with the first lens having a focal length less than the second one (f1 < f2.) Kind of what the problem looked like. The distances between the two parallel rays (the beam...

First off, please excuse my general lack of physics knowledge, it's been 10 yrs since one year of it in high school ... but I can usually follow along pretty well once pointed in the right direction. I've been curious about the relationship of wheel weight and diameter in relation to distance...

Hey, I was wondering what were would happen to the fluid flow or if this would cause any structural problems to the following case. A vertical pipe of 150mm diameter and roughly 3 metres in length is at the bottom of a large tank. At the bottom of the pipe is a coupling which leads to...

Homework Statement X, Y are metric spaces and f: X \rightarrow Y Prove that f is discontinuous at a point x \in X if and only if there is a positive integer n such that diam f(G) \geq 1/n for every open set G that contains x Homework Equations diameter of a set = sup{d(x,y): x,y...

hi everybody Question: a length of uniform wire has a R of 2 ohms. calculate the R of a wire of the same metal and original length but twice the diameter. I thought as the wire gets twice as thick the R must halve to 1ohms. But the solution is 0.5 ohms. what did i do wrong? thanks...

In AWG Gages, how diameter is inversely proportional to the cross-sectional area of the conductor?

Homework Statement Define diam(X) of a set X, X a nonempty subset of arbitrary metric space, as diamX=supremum{distancefunction(x,y):x,y in X}. Let K be the two cell formed by two points a=(2,3) and b=(4,6) in the xy plane. Find diameter of K and show this is the diameter. Homework...

Ball in a Beaker - Diameter - Please Help! Homework Statement A thread attaches a 2.73-g Ping-Pong ball to the bottom of a beaker. When the beaker is filled with water so that the ball is totally submerged, the tension in the thread is 6.75 mN. Determine the diameter of the ball...

Homework Statement 1 The density of copper is 8930 kg m-3, its mass number is 63.55 and its atomic number is 29. a) Calculate the mass of a copper atom in kg. b) How may electrons and protons does a copper atom have? c) Estimate the diameter of a copper atom...

Homework Statement In ΔABC, ∠A = 90°, M is the midpoint of BC and H is the foot of the altitude from A to BC. A circle l is drawn through points A, M and C. The line passing through M perpendicular to AC meets AC at D and the circle l again at P. BP intersects AH at K. Prove that PM is...

Homework Statement Find the Average Grain Diameter Homework Equations d= C/NLM The Attempt at a Solution My instructor hasn't defined what C or M are. I could easily solve this equation if I just knew which numbers I am supposed to substitute in for C and M. NL is the average...

it seems like looking at beam patterns from directional RF antennas the beamwidith is something like inversely proportional to the parabolic reflector diameter. why can you make an almost perfect strait parallel beam of light but not with RF?

Homework Statement A metal rod with a 0.5 inch diameter is subjected to a 2000 lb tensile load. Calculate the resulting diameter of the rod after loading. Assume that the modulus of elasticity is 10,000,000 psi, Poisson's ratio is 0.33, and the yield strength is 21,000 psi. Homework...

On a computer simulation (Simion - ion simulating program) I've got two cylinders (with a small gap between them) through which an electron beam goes through. I understand that the "lens" refers to the equipotential lines, since they form a bulge at each end, just like an optical lens. What does...