Impact Definition and 911 Threads

Homework Statement I am a student and have a question: For a small case study I have to determine the lateral and vertical impact loads during the installation of a object onto another object. This is done by a cranevessel, using its dedicated lifting crane. However, I am not familiar with...

What affects how fast the water come out of the tube?(size of tube, size of opening where the water enters, etc) thanks in advance.

Homework Statement I am trying to prove a human head hitting the ground after falling backwards down a hill suffers a significantly greater impact than one hitting the ground on a flat surface. The person is 95KG, 180cm tall, and the impact point of the head was 60cm below (in altitude) the...

Homework Statement A 3.20 g lead bullet at 28.0°C is fired at a speed of 210 m/s into a large block of ice at 0°C, in which it becomes embedded. What mass of ice melts (g)? Homework Equations I thought that the KE of the bullet would be transferred into heatThe Attempt at a Solution I used...

Hi, I have an optical model, fully programmably controllable with python. I want to know how much my variables (say N) of my model impact a certain parameter (i.e power, abberations). Now I have no clue how to go about this. There must be some analytical (numerical) method that I could use but...

Hi I'm new to this forum and I might have putted this thread in wrong section. My question i would like to get answered its a bit complicated, I know... I have had very weird accident while riding a motorcycle as a courier in London. I don't know what caused the accident because I lost memory...

I have a hypothetical question. If there was a relatively Earth-like planet out there that somehow experienced a rather catastrophic meteor impact large enough to alter its axial tilt close to 0 degrees, would such an event render the planet essentially a desert world? I.e. there are no more...

Homework Statement I am doing a project on pressure sensitive films and finding if they indicate the correct amount of impact. I have carried out an impact test by dropping a mass of 5KG from a height of 1m. I have calculated the velocity to be 4.43m/s. The kinetic energy just before impact is...

City bus estimated at 50,000 lbs is at a stop light and completely stationary. It's on a flat surface. Bus is hit by a 3600 lb car traveling at 45 to 50 mph hits bus from behind. This bus is shoved fforward 3 feet. 275 lb person leaning into frame of bus just above where the impact occurred. How...

Hello, I have an installation tool (which basically consists of a standard long bolt and nut) and a 100 lbs mass object would drop onto it (as if it were a hook) from about 1 - 2 inches. There are many forces to consider and I am looking into that. Since this installation tool will be...

Reading about meteorites, I have found this idea of "antipodal earthquakes" or "antipodal vulcanism" after a major impact several times. There seems to be perfectly good papers for and against, together with the usual crankish "information." There also was a thread here about the issue almost 4...

I believe my attempt below is correct but I'm not 100% sure, any guidance welcome. 1. Homework Statement Suppose a meteor of volume 1000 km3, density 5000 kg m-3 and speed 30000 km hr-1 crashed into the ocean and 10% of the impact energy was converted directly into heat. i) Estimate the...

I was wondering something, I dropped a box onto my glass desk but it didn't bounce back, I also hit a hammer against a rigid wall, the matter smacked into the wall, it has KE. It never bounced back, I didn't see any deformation or rebound in either situation, I wasn't hitting too hard nor...

can someone help me determine the impact speed of a vehicle if i provide specifics? i keep coming up with different answers!

Homework Statement Just prior to impact with a golf ball (0.042 kg), a clubhead (0.195 kg) is traveling with a velocity of 33.7 m/s horizontally towards the target and a vertical velocity of 0 m/s. The coefficient of restitution between the ball and club is 0.79. Impact lasts for 0.00043 s. The...

Homework Statement two people kick a ball. one of them kicks it with a force of 215.0 Newtons. the other one with 189.0 Newtons. their approach creates a 210.0 degree angle at the point of impact and causes the ball to go in a different direction. what is the resultant of the vector from this...

Homework Statement A container contains a given mass of ice and a given mass of water both at 0 degrees Celsius. A given mass of aluminum is heated up to some temperature and submerged in the water-ice mixture. No heat enters or leaves the container. Given the specific heat of water and...

Wondering the best way to go about calculating the ability of a silicone wafer to withstand impact. Wanting to possibly use a small pc as a fracture barrier to indicate that a part was dropped and may potentially be damaged. Need it to handle 20G. Alternative mat'l suggestions would be...

Hi. I am re-engineering a 40+ year old carburettor design. The current throttle slide has stress raiser flaws and is the same material as the mixing chamber that it slide interfaces with. The prototype slides were printed in ABS for fitment trials. The functional trials used Acetal allowing for...

Ok folks I have a down hole oil tool which seals a well bore. it weighs 63KG (139 lbs) I have worked out that it is being loaded up from above with 53879 lbs. by applied pressure/ hydrostatic pressure if it was to instantly release and drop 7m what would the impact force be on a restriction...

Consider a case- Force excerted on a stationary flat plate held normal to the jet. The Jet strikes on plate (see fig.) Which is smooth hence the exit velococity of jet = entering velocity of jet. According to theory. The fore is applied on plate due to change in momentum of jet. But my doubt...

Back home, the average depths of the world's oceans--and the Mediterranean Sea--are as follows: Atlantic--3926 meters Pacific--4028 meters Indian--3963 meters Arctic--1205 meters Southern--4500 meters Mediterranean--1500 meters In this alternate Earth, the average depths are as follows...

1. Which will have the greater force during impact; a bumble bee being hit by a train or a train being hit by a bumble bee? (Hint: Newton’s Three Laws of Motion) 1. What is the centripetal force that holds the Earth in orbit around the sun? 1. How much does a 76.0 kg person weigh on Earth in...

I'm having my degree FYP with the title of 'water landing: conceptual design of float component of seaplane upon touchdown'. 1. ) I need guideline for calculating impact force of the seaplane when it touchdown on the water surface. 2. ) Regarding the landing time and landing distance. I'm...

On page 60 of srednicki (72 for online version) for the $$\phi^{3}$$ interaction for scalar fields he defines $$Z_{1}(J) \propto exp\left[\frac{i}{6}Z_{g}g\int d^{4}x(\frac{1}{i}\frac{\delta}{\delta J})^{3}\right]Z_0(J)$$ Where does this come from? I.e for the quartic interaction does this...

I have been asked by a piling engineer to try to come up with an alternative to static pile testing in a restricted access site. Normally a pile test is carried out by applying a static load to the ground and measuring the deflection of the pile under the load. This of course requires a large...

Please be patient with my ignorance. :) I have just learned in the LHC's own website ( http://lhc-machine-outreach.web.cern.ch/lhc-machine-outreach/beam.htm ) that their proton beams traveling at 0.999999991c carry about 362 MJ of energy, equivalent to 77.4 kg of TNT. These beams seem to be...

Light, amount other things, have no mass, and therefore is able to attain the highest speed possible in this universe. Yet for some reason this speed is not infinite, as would what intuition dictate, but has a finite value. Would it be fair to say that the fact light, something that "should" be...

Hello, i want to determine the velocity with which an object moves after it has departed a rotating disk. In my problem there is a disk rotating with the angular speed w. On this disk there is a drilling in which a mass m is positioned. In case the thread in the drilling fails i need to...

Hi all, I am doing a High Velocity Impact testing using a gas gun I have to figure out a) is my test running well and I am not getting any reflection? Please correct me or help in calculating if I am wrong at any point. I guess, I can figure out by calculating the time required for the...

I'm trying to understand a few things about the kinematics of collision processes. I guess it's because we calculate the scattered angle of the projectile and then back calculate to get a value for the impact parameter. Is this right?

Homework Statement A proton of mass m, charge +e and (asymptotic) momentum mv is incident on a Nucleus of charge +Ze at an impact parameter b. Consider only coulomb repulsion and classical mechanics, what is distance of closest approach - d? Homework Equations Haven't encountered impact...

So I am in my first year of my physics degree at a school that isn't really known for its physics program, (I don't believe it is ranked at all, not that that is a huge deal) and at least right now I am very interested in pursuing a ph.d degree. I had originally intended to do an engineering...

Hi, I'm having trouble answering Question 9.20 in Hobson's book (Link: http://tinyurl.com/pjsymtd). This asks to prove that a photon will just graze the surface of a massive sphere if the impact parameter is b = r(\frac{r}{r-2\mu})^\frac{1}{2} So far I have used the geodeisic equations...

Homework Statement This is the second part of a two part question. The first part asked for the maximum force that can be applied to a bone with minimum cross-sectional area is 3.0cm2, Young's modulus 1.4 × 1010 N/m2, and can withstand a 1.0% change in length before fracturing. I calculated it...

Let's say that there is a sort of large concrete wall, that applies an average force of 12,900 N for .04 seconds while you're initially at rest. After the impact, your momentum is now 516 N*s. Your mass being of 50 kg, means your speed is 10.32 m/s. So, in terms of kinetic energy, you've gained...

Homework Statement Most geologists believe that the dinosaurs became extinct 65 million years ago when a large comet or asteroid struck the earth, throwing up so much dust that the sun was blocked out for a period of many months. Suppose an asteroid with a diameter of 2.0km and a mass of...

So I know that a few of these questions have been posted previously but I also understand that each circumstance is different in regards to each aspect so I figured I would post the question and see if anyone can assist me at all. Whether it be out of the goodness of your heart or in exchange...

http://www.sciencemag.org/content/350/6256/76 [ The concept is that the impact increased the lava flow markedly. So the ecological impact of the impact was extended over a longer period of time by the vast lava outflows for several hundred thousand years.

Homework Statement The diagram shows the impact of 20 projectiles launched at the same speed and angle. What is the uncertainty in the impact position? (see attached file for picture of diagram) Homework Equations No equations, my lab instructor said through an email that I can get it "just by...

A ball travels vertically downwards until it hits a concrete floor with speed 16.1-m/s. It then bounces vertically upwards at 3.4-m/s. Examination of a high speed video shows that the collision took 1.1-ms. Considering just the collision, what is the magnitude of the average acceleration? b)...

Hello, I have been turning to this subject and tried to develop the right equation on my own. What I did was: [FONT=Georgia]mgh = ½kx2 (fall energy = spring energy) x2 = 2mgh/k (obviously devided by ½k) sqrt(2mgh/k) = x (taking out square root) F = mgh/x = mgh/sqrt(2mgh/k) = sqrt(½mghk)...

Hi guys, I have been searching for references that could tell what are the average limits of impact (in Newtons per example) of running activity into human´s feet (material = bone). Basically the question I am trying to answer is per example to understand how much of linear acceleration...

How do you calculate the amount of pounds per square inch force on say a female human being approximately five feet tall at 185 pounds at rest being struck by a moving vehicle at motion by gravity with a curb weight of 2700 lbs going 4 mph.

Could someone help me with this problem? I have a scenario where a glass door is being caught by the wind and slamming against a door stop and shattering. I would like to work out the impact energy of the door hitting the stop, and if possible an equivalent static force. The door is 1.5m...

I recently read that the impact of air resistance on the horizontal range increases as the launch angle increases (http://moodle.davidson.edu/moodle2/pluginfile.php/121168/mod_resource/content/2/Brancozio%20fly-ball%20paper.pdf). A graph depicting this is attached. Is there a reason for why this...

Hi, Homework Statement I'm doing some research into the hydraulic jump and was wanting some help in calculating the impact force. Hydraulic jump is a phenomenon to do with the turbulence of the water - it is the 'ring' around the stream of water when a tap is turned on Homework Equations The...

Hi, I'm doing some research into the hydraulic jump and was wanting some help in calculating the impact force. The equation I have found to use is: F = m g h / s I have the mgh, and was wondering what to use as the slow down distance. If you didn't know what the hydraulic jump was, it is a...

Homework Statement A ball rolls off a table at speed v and impacts the floor at distance d. What is the angle between the path of the ball and a vertical line drawn at the moment of impact. Homework Equations I have derived from basic projectile motion formulae: Time of impact t =...

This EJP paper is open access, so you should be able to read it. The conclusion isn't unexpected, because having a "scaffolding" to guide a student through a problem is almost like hand-holding without an instructor being there. I've used this type of questions during quizzes and maybe even...