Elasticity Definition and 203 Threads

a structural steel rod has a radius of .5 inches and length of 32 in. 4000 lb force stretches along its length. modulus of elasticity is 29 x 10^6 psi. Need to figure out stress on rod, the elongation of rod due to force, and strain on rod due to force Homework Equations The...

Homework Statement When the water freezes it expands by about 9.00%. What pressure increase would occur inside your automobile engine block if the water in it froze?(The bulk modulus of ice is 2.00 x 10^9 N/m^2).Homework Equations B=\frac{\Delta P}{\Delta V / V_i} The Attempt at a Solution If...

Homework Statement Find the deformation of the object (delta l). Graphic: http://img202.imagevenue.com/img.php?image=59612_fis1_122_218lo.jpg" Y = young's modulus W = weight of the objects (see the picture) Homework Equations d = density d = M / V d = M/(A*delta l ) M =...

I am trying to understand how to solve a certain type of elasticity problems. Let's say that we have an isotropic material (2 elastic constants are known) in zero gravity with a shape of a half space (limited by the boundary plane and infinite on one side of the plane). Boundary conditions...

If I have a soft base (mud or sand) and place 4 rocket balloons (long narrow ones used for twisting into shapes, animals, etc.) all inflated to the same pressure, but each balloon of a different diameter (1", 2", 3" and 4") and place platform (a thin, but rigid sheet of plastic) on top of the...

Homework Statement A continuous and aligned glass reinforced composite consists of 40 volume % of glass fibers, having modulus of elasticity = 10 X 10^6 psi and 60 volume % of polyester resin that when hardened, displays a modulus of elasticity = 5 X 10^5 psi. a) compute modulus of elasticity...

Homework Statement The board's left end is fastened to a fixed support by a connection that is free to pivot. The board is supported to its middle on another fixed support point. A diver of mass 60 kg stands at the end of the board. (ignore the mass of the board for this problem) The...

Hi, I need some help regarding an elasticity question I am attempting. I have done the first two questions and need someone to check over what I've done. I also need some direction on how to attempt part c, as I'm feeling a bit clueless on where to begin tackling this. Homework...

How can I get the elongation if I'm given with only the modulus of elasticity? what will be the formula? THnx..

Elasticity! Pressure! Homework Statement A cylindrical steel pressure vessel with volume 1.3m^3 is to be tested. The vessel is filled with water, then a piston at one end pushes until the pressure inside increases by 2000kPa, then suddenly a safety plug on the top bursts. how many litres of...

How come both spring and rubber band are elastic whereas spring are contracted and rubber bands are stretched? I understand that elasticity of an object depends on it ability to reform from deform. I also get that spring works b/c of normal force(too much contraction...right?-being the reason...

[SOLVED] Equilibrium and Elasticity problem need help homework due tomarrow Homework Statement two identical, uniform, and frictionless spheres, each of weight W, rest in a rigid rectangular container. A line connecting their centers is at 45° to the horizontal.Find the magnitude of each of...

A mass sitting on a horizontal, frictionless surface is attached to one end of a spring; the other end is fixed to a wall. 3 J of work is required to compress the spring by 0.12 m. If the mass is released from rest with the spring compressed 0.12 m, it experiences a maximum acceleration of 19...

a uniform beam of weight 400 N and length 3.2 m is suspended horizontally. On the left it is hinged to a wall; on the right is it supported by a cable bolted to the wall at distance D above the beam. The least tension that will snap the cable is 1200 N. (a) What value of D corresponds...

[SOLVED] Need double check on Price Elasticity Please Question: If the price of soda doubles from $1.00 per can to $2.00 per can and you buy the same amount, what is your price elasticity of demand for soda, and is it considered elastic or inelastic. Formula: % of Change in Quantity of...

Hi all first post. Myself and my friends are very much stumped by this question. Any help would be much appreciated! Homework Statement A body with mass m collides directly with a body of mass 3m. If two thirds of the original kinetic energy is lost, find the coefficient of elasticity for...

Price....Quantity demanded.....total revenue....Arc elasticity(elastic, unitary elastic,inelastic) 10......50 20......40 30......30 40......20 50......10 a)complete the total revenue column b)complete the arc elasticity for each price change and complete the...

Hiya, I have had to do an investigation on hookes law as part of my primary school teaching course. i am by far not the best at understanding physics. Can someone please explain to me what effect the width of a piece of elastic has on its elasticity and why? thanks

Homework Statement Figure is an overhead view of a rigid rod that turns about a vertical axle until the identical rubber stoppers A and B are forced against the rigid walls at distances rA = 7cm, rB = 4cm. Initially, the stoppers touch the walls without being compressed. Then force F of...

If the two particles with equal masses m collide with elasticity E = 0.650 , what are the final velocities of the particles? Assume that particle 1 has initial velocity v and particle 2 is initially at rest. Give the velocity v_{1} of particle 1 and the velocity v_{2} of particle 2. Express...

This is quite tricky.. How to measure the elasticity of balls using a collision method? apparatus: air track blower gliders motion sensors (2 sets) 2 tennis balls How do i do this?

A 0.230 kg block on a vertical spring with spring constant of 4.75 103 N/m is pushed downward, compressing the spring 0.058 m. When released, the block leaves the spring and travels upward vertically. How high does it rise above the point of release? I have some equations in front of me but...

Homework Statement The strain in a rubber ring on a rim of a wheel of radius 0.40m is 3*10^-3 when the wheel is stationary. The normal push of the rim on the ring just becomes zero when the wheel is rotating at angular speed 'omega'. Calculate the value of 'omega' if Young's Modulus for the...

Hello: Can you tell me where on the internet I can get a good source on elasticity? Thank you

Hi. I was wondeirng if anyone knew the modulus of elasticity for Basswood and Balsa wood under compression.. I found numbers but its all different.

The following was "split-off" from https://www.physicsforums.com/showthread.php?t=171079

Hi, I'm not so well informed on plastics and chemistry to them but I need help finding a plastic that will fit the purposes of my need and uses. I'm looking for a plastic that is clear and elastic(doesn't have to be very elastic), or is the word I'm looking for plasticity, I'm not really sure...

Hey all, if a cue ball moving at a certain velocity collides with the side cushion generally the ball will not deflect at a nice angle as the ball would compress into the cushion due to the elasticity of the cushion and energy loss of the ball to the cushion would be reduced. Using Hooke's...

im confused as to how density is incorporated in this problems solution. any help as to how to solve this problem would be much appretiated. consider a heavy cable of diameter d and density p from which hangs a load of mass M. what is the tension in the cable as a function of the distance...

1. INTRODUCTION. This thread is an experiment. I think the public discussion between myself, pervect, and Greg Egan in the rotating hoop thread has given students and the interested public and glimpse into how people actually think about a challenging problem, but I guess the discussion went...

you have been given weight density Ao of water at normal atmosphere pressure Po and you asked to find its new weighty density A1 if the new pressure s P1. I tried to solve it assuming that if there is a compression( increase of pressure) the weighty demsity decreases. But how to find it and...

I've got a computer plot showing relations between stress and strain for steel. But how can I find the modulus of elasticity (E) from the graph? Isn't it so that E=(stress/strain)? The thing is that I get very different answers when I compute E in this way for various points on the graph.

Hello, I have seen more than often discussions about accelerated rods, or spinning disks in relativity. It is clear that the definition of a rigid body in relativity makes problem. I wonder if there are some books or papers giving a complete theory for relativistic elasticity. I have...

Two identical, uniform, and frictionless spheres, each of mass m, rest in a rigid rectangular container. A line conecting their centers is at 45 degrees to the horizontal. Find the magnitudes of the forces on the spheres from (a) the bottom of the container, (b) the left side of the container...

Okay, here is the problem: If the elastic limit of copper is 1.50E8 N/m2, determine the minimum diameter a copper wire can have under a load of 10.5 kg if its elastic limit is not to be exceeded. Obviously I am looking for d in this problem. I am given the downward force (102.9 N = ma); A =...

hi guys... can you please help me with these problem? it says... a vertical solid steel post 25 cm in diameter and 2.5 m long is required to support a load of 8000 kg. you can ignore the weight of the post... what is the stress in the post? what is the strain in the post? and what is the length...

Imagine a bungee jumper dropping from a high cliff. When he reaches the point where the rope is just about to be stretched we can say he has reached his max. velocity. Then the rope will be stretched and when it has reached its maximum deformation, the jumper will "bounce" up and again make the...

How does elasticity change in a high water pressure environment? For example, assume you drop a common rubber band in the ocean. As the rubber band sinks, water pressure increases on the rubber band. Excluding any change in temperature of the rubber band, how does the elasticity of the...

A tunnel of length L = 154 m, height H = 7.4 m high, and width 6.1 m (with a flat roof) is to be constructed at distance d = 60 m beneath the ground. (See Figure 12-50.) The tunnel roof is to be supported entirely by square steel columns, each with a cross-sectional area of 960 cm2. The mass of...

Hey everyone, just wondering if there is any way that price elasticity of demand and supply can be measured in the sharemarket? thanks for your help

Is it possible to find the yield stress of a material with only modulus of elasticity and Poisson's ratio? I was given a problem that: What is the min. aluminum needed to support a block (10 Newton) to 1 meter high? E=70GPa and v=0.3 are the only given aluminum properties. I would know...

i have tried to figure out what formula to use on this and can't seem to get it please help A spring having elastic constant 22.8 N/m is stretched to a length 15.1 cm. Suppose an object of mass 130 g is attached to the end of the spring. (a) How much kinetic energy will the system have after...

Just to let you all know I really appreciate your help. Problem A person is doing bungee jumping from a 100m platform. Let's say that the rubber cord's coefficient is k = 6500 g/s^2. Would a 60 kg person hit the ground when jumping using that rubber cord? The two equations that are given...

I would like to know the effect of temperature on the elasticity of substances. I have searched on the internet and have not found anything. :confused: My current line of thinking goes thus: Modulus= Stress/strain Strain = increase in length / original length For higher temperature...

Hello, hope this is the right place for my question; Someone can help me with this one? I have got the results of a study about the growth of the chemical industry in a certain region. I got in discussion with the authors of the study because I saw that certain chemical projects which will come...

Hi, I have been reading about the cavendish experiment and in one equation they say that T = 2 \pi \sqrt{\frac I k} where I is the moment of inertia and k is the elastic constant. in my physics books i only find T = 2 \pi \sqrt{\frac m k} where m is the mass, not the moment of...

Can quantum theory be connected with Elasticity theory? I am a graduate student in Mechanics, and I am doing some theoretical/applied elasticity research. And to some extent, I am working with Material Science problems. The relationship of Quamtum Theory with general Mechanics puzzles me. For...

can anyone help me with this please...? :eek: How much pressure is needed to compress the volume of a steel block by 0.14 percent?

A Uniform rod is fixed from top and becomes stretched under its own weight.Then which of the following will be true on its elongation: a) Diameter at the top is smaller than at the top b) Diameter at the bottom is larger than that of top c) Diameter is uniform throughout d) Dimater becomes...

I have a question on finding elasticity of colloids. I am using Ultrasonics testing on testing the different elasticity of gelatine with different concentrations of additives, ie, salt, sugar. From the ultrasonics data, I calculated the attenuation coefficient and the velocity (speed of...