Shock Definition and 221 Threads

Hello, we are doing an activity at work to calculate what the shock load would be on a wire cable under the following conditions. There is some conjecture on how best to do this so we figured it would be best to ask some people with bigger brains than us ;) Hopefully the following info is...

Q: Does a human being is forced away from the wire when he touched the wire and got an electric shock? what is the voltage and force of the shock that applies a force on the person to jump away from the touched wire.

elctrical shock?? It is said that, when working with electricity we should wear shoes for safety from electrical shock... Lets say I am wearing shoes and by mistake i put my finger in a 230 V a.c. socket ,,,,, will I be feeling any electrical shock or not...

I'm trying to write a MATLAB .m-file that will calculate the lift and drag on a supersonic airfoil using only the angle of attack, mach number, and geometry of the airfoil. I'm getting stuck on the oblique shock angle calculation because I cannot find an equation that is solved for the shock...

At freestream M=2 will the red dashed shock exist? I know there is a shock wave on the bottom.

I have heard that 'we don't get shock from dc current because it is constant but we get shock from ac current because it is alternating'.Is that true? If it is HIGH VOLTAGE DC CURRENT THEN?

I am to design a shock absorber for my project. Pl tell me what material the various components would be made of. Just gimme any rough idea you would have or just make a wild guess Anything! I just need a start and then I will take it from there. I have designed the thing on Solidworks but do...

As part of an engineering design project, I am using shock switches to measure accelerations of an object. As the name suggests they are just switches that turn on when a shock above a certain value is experienced. Does anyone know the details about how the switch contact is closed when it...

If a thunderstorm approaches, would you turn off your electronics, unplug them or rely on a surge protector to avoid frying your circuits?

Hi guys, i need some help on this topic. Basically, i need to calculate the angle of reflection of a oblique shock on a solid boundary. Here is the description of the question i have: an incident supersonic flow reaches a compression corner, with a deflection angle of 15 degrees...

So I'm having a bit of culture shock going from academia to industry. I've come into a situation where management wants a positive report to be given to a customer. The customer gave us some equipment and wanted us to perform an experiment for them. The results of the experiment is...

If you induce a shock wave in a covalent crystal using an ultrashort laser pulse, is there any way to estimate the temperature rise in relation to the pressure? Say I want to induce pressures of 10's of GPa. Is there a general way to think of this problem? I know next to nothing about shock...

After reading an article a few weeks ago about a man who had made a bicycle with a triangular & pentagonal wheel & started doing some reading on the shapes. Made a model of it but would like to try & make a full size one as we realized that it needs some parts that I couldn't make out of...

Hey there, I'm new to the forums, while I did get an A in my physics class, in no way do I consider myself an expert. That's why I figure you guys could answer my question best. I am working on a project and I was wondering what the most shock absorbent material is that I could purchase...

I have no experience with shock sensors and am looking for some insight. The ones I have found say a range in g's (example - range: 10,000g) and then give a maximum value. I was wondering if the range would be similar to a minimum that the sensor is able to read or how close to the given range I...

Impact of electric shock on human body is above all with electric current, not with electric power. The dead limit is somewhere 100 mA. Why current and not power? The main effect of electric shock are on heart and thermal efect. Obviously, thermal efect is by electric power, so it is not the...

Hi, does anyone know the definition of "stagnation pressure" at the tip of a slender body with attached oblique shockwave? Since the shockwave is completely "attached" to the pointing tip, I think that there is no flow "behind" the shock at the tip. So I proceed to think that the...

Homework Statement a ride at a them park is a vertically ascending/decending ride. The total mass of the 10 person carriage is 750kg (people included). the ride rises up to the top of the ride until stationary waits for 2 seconds and then drops at a rate of 10ms-2 for 3.5m. when near the...

Dear topic mates! I'm an electric engineer and physicist student from Hungary. I looking for description of the spherical shock wave propagation in liquids. I need a formula which give the relationship between the propagation velocity and time. Additionally, I wonder the pressure at the...

I am in shock :( Sorry, I have to write about it. I had a close friend 25 years ago, we studied chemistry together. Somehow we haven't seen each other since then, just now and then exchanged messages/informations through mutual friends. I have just learned that two days ago his 18 yo son...

Homework Statement For the case of a strong shock propagating into a gas with \gamma=7/5 What is the ratio \rho2/\rho1 Homework Equations \rho\ u=constant P+ \rho\ u^2=constant \frac{1}{2} u+ \frac{\gamma }{\gamma -1}\frac{\ P}{\rho} = constant The Attempt at a Solution I can use the 3...

An abrupt slowdown in concentrated traffic can be travel as a pulse, termed a shock wave, along the line of cars, either downstream (in the traffic direction) or upstream, or it can be stationary. Figure below shows a uniform spaced line of car moving at speed v = 25.0 m/s toward a uniformly...

I have a mountain bicycle with a rear spring shock absorber. Recently the shock absorber broke. Until I can purcahse a replacement I was thinking of building a rigid piece of steel to replace the shock, essentially making my bike a non-suspended unit, but still be able to ride it. So here...

Please could anyone help me on the topic "Controlling the vibration and shocks received by elctronic-mechanical components"?

Homework Statement A supersonic jet traveling at Mach 3.00 at an altitude of 20,000 meters is directly over a person at a time t=0 as show in figure (see below). (a) At what time will the person encounter the the shock wave? (b) Where will the plane be when the "boom" is finally heard? (Assume...

I've done searching on the topic, and I really don't know where else to turn, so here it goes. I hope somebody can point me in the right direction. I've been working on using a shooting method to solve the steady-state spherically symmetric fluid equations for an accreting plasma. Basically, it...

I'd like to open a discussion on the ins and outs of shock absorbers on cars. The ability of a device to restrict the extension of the suspension springs works miracles that are not always appreciated.

Why Electric eel doesn't electrifying itself ?

Hi all. We are to compare the effect of a shock wave, that is the irreversibilities associated. We have comptued that the upstream and downstream velocities of a shock wave are 1029 m/s and 266.8 m/s respectively. The upstream pressure and temperature is 105kPa and 290K. What question...

Homework Statement You look directly overhead and see a plane exactly 1.4·km above the ground, flying faster than the speed of sound. By the time you hear the sonic boom, the plane has traveled a horizontal distance of 2.4·km. (a) Find the angle of the shock wave cone. (b) Find the...

Why are we more likely to get a shock on a dry day than on a rainy day?

Can someone explain to me how shock waves from supernova or stellar winds can generate a superbubble? Does the energy from the shock get converted to thermal energy through compression?

Why the neutral wire (the cold) does not cause an electric shock?

Physics help, urgent! Homework Statement The damage caused by electric shock depends on the current fowing through the body; 1 mA can be felt and 5 mA is painful. Above 15 mA, a person loses muscle control, and 70 mA can be fatal. A person with dry skin has a resistance from one arm...

[FONT="Book Antiqua"][SIZE="3"] Hello, the question I have to answer is above in the Title...I thought that the V shape of the shock wave gets wider the faster you are going. No? Thanks Zach

HI, I couldn't decide which forum was the best to post these in. I have two questions regarding electricity and getting shocked, or electrocuted. 1. Being shocked from the spark plug leads on either small engines (lawnmowers) or cars. Classically, on either of these, you have a coil which...

When a star explodes, does the shock wave move faster than the local speed of light? If it does, what effects would this have? A little explaining is in order... While the actual speed of light does not change (c in a vacuum) the overall progression of light is greatly slowed down due to...

Can someone explain to me the physics involved in this? Why does the dampener absorb some of the shock? Where does that shock go? This sort of stuff... Please do explain Thanks in Advance

Is there a cheap way to measure static correction on a shock collar for dogs? Thanks in advance, Mac

Hi everybody ! I have used FLUENT to do the following simulation ( it's 1.5 cm, not 1,5) http://upload.tinhco.net/thoai/debai.jpg I set 500 for "Number of Iterations". After running Fluent, I saw CL and Cd have convergenced, then I turn off the interation process. And here are my...

Hello everyone! This might be bit of the 'electrical engineering' topic - but maybe someone out there can help :) Does anybody have any idea of what the maximum frequency of a piston in a shock absorber of a forumula 1 car is? What do i mean: How many times does the piston (in a shock...

I just had an electric shock, not a lethal one, it just burnt one finger a bit, but now i have a tooth that is going tick tick all the time, it is annoying and is hard to ignore. Any one have an idea why??

Why is it that when you put your two finger on the opposite terminals of a 1.5 V battery, you don't get an electric shock? (Or maybe you do, but you just don't feel it?). I am guessing that this is because our body has a high resistance, is that correct?

I am looking for a material to use, namely Silicon Carbide, and it gives a "Thermal Shock Paramter - 167C" Obviously thermal shock is going to be failure when there is a rapid temperature change, but what does 167C mean? It's not a rate of cooling, just a temperature. I can't find anything on...

I am designing a piece of test equipment that will be mounted onto a small rocket for meteorological testing. The people running the rocket side have mandated a series of tests that all test equipment must pass before being fitted. One set of tests are pretty severe shock tests...

I heard recently that Wheat (grain) production decreased due to drought in Australia and other areas, e.g. midwest US. Several countries have curtailed or reduced export and in some cases are now importing. At the same time, the cost of production has increased, in part due to increased energy...

I have developed new tables for moving shock and I wonder if any one has seen these kind of tables? These tables appears in book "fundamentals of compressible flow mechanics". The book and software can be download from www.potto.org. If you seen these table please drop me a...

Earthquakes produce several types of shock waves. The most well-known are the P-waves (P for primary or pressure) and the S-waves (S for secondary or shear). In the Earth's crust, the P-waves travel at around 6.5 km/s while the S-waves move at about 3.5 km/s. The actual speeds vary depending on...

Ok, I watched a TV show where they showed a test of a building designed to handle an attack like the OKC incident. There was a visible overpressure wave on the high-speed film that hit the building and cracked the glass and knocked a couple pieces of sheetrock loose (the building otherwise...

Okay, I got this worksheet today and my teacher didn't explain to me what shock cones were. So here's the problems, and what I did so far to work them out. "An aircraft makes a supersonic pass 382 m over an observer. the shock wave pounds the observer after the plane is 405 m past her...