Impact Definition and 956 Threads

Just a quick question of of curiosity. It's basic physics but I can't remember it :redface: Lets say you have two balls of equal mass about 3 meters up on a ledge. You let one drop straight down, it hits the ground and stops. The other one is pushed forwards with a speed of let's say 1m/s and...

Mini black holes have been postulated to exist at the realm of sub-atomic particles. What effect would these micro black holes have on other sub atomic particles? Also, apparently, the mass of one of these mini black holes is the same as mount everest (or some other large mountain)

If the moon was to be stopped, what would its velocity be just before hitting the earth? Also, if you could throw in the force of the impact, that would be great too. And another thing, how long would it take?

Can anyone explain to me why Pythagoras' Theorem governs the rate of change, of mass, length and time within accelertated bodies? It's a simple theorem learned by most children by the age of eleven, so one would expect the answer to this question to be quite simple as well.

Homework Statement A gun on the shore (at sea level) fires a shot at a ship which is heading directly toward the gun at a speed of 40 km/h. At the instant of firing, the distance to the ship is 15,000 m. The muzzle velocity of the shot is 700 m/s. Pretend that there is no air resistance...

Heya, I need help answering a question: If i drop an object that weighs 100 pounds from a height of 6 feet what will be the impact in pounds when the object hits the ground (assume that the ground is a hard surface)? Thanks for any help that you guys can provide. edit: I just...

Hi, i am working on a high school project on how various factors (mass, height and sand particle size) affect crater diameter. I am struggling to find a solid hypothesis/ theory on this question. I have found out that the cube of the diameter is proportional to the KE of the ball, but i am...

Got the first part; the second part of the question asks what angle of inclination the bale will strike, given between -180° and 180°. Drawn out, this seems to resemble a right triangle with a 65 m height, 200.4188 m length (initial X velocity = 55 m/s, time of 3.6422 s), and the inverse tangent...

Hi everyone -- I'm brand new here and didn't really know where to post this question. It's just that some friends and I were drinking beer last night and we began to wonder about something. If you were on a stationary (non orbiting) platform 100,000 miles from Earth and you stepped off of it...

I have a question about RMS voltage. I know Vrms is Vpeak/sqrt(2) if the sine wave is centered around 0V, but what if the voltage has a DC offset? Shouldn't this mean the RMS voltage is more?

Galileo's trial, concerning whether the Earth is moving or stationary, is an example of the intense interaction (conflict) between science and religion in the 17th century. Galileo was put into house arrest in 1633 until his death for suggesting that the Earth is moving. Is the interaction...

if all the ice sticking out of the water from only the icebergs were to melt, would the water level go up or down?

How internal reflection affect the performance of the thin film emissive display devices?

I am in the middle of physics debate with someone who has some rather, shall we say, unconventional views regarding classic mechanical physics. It started when he posted that he feels 9/11 was a conspiracy because a section of a building falling does not increase the "load" (as he called it) on...

I just saw Blood Diamond. I don't know how to say this, but I am never going to buy a diamond in my life.

Car tires seem to bounce very well however they are easily unbalanced and tend to tip over very easy. If you were to connect say 2 or 3 similar tires together and then dropped it, it should prevent the tires from tipping over and stop bouncing. This will however make the mass significantly...

What is shear flow? Hat this flow viscosity? .... Thank you

Hello, I am probably going to suffer some embarassment, once I see the answer to my question. Anwyay, I need to calculate the distance needed to create a 5ft-lbs. impact with a 1.18lb. sphere being dropped vertically onto a surface. How would I go about calucating the vertical distance...

Homework Statement On a frictionless table, a glob of clay of mass .48kg strikes a bar of mass .94kg perpendicularly at a point .34m from the center of the bar and sticks to it. 1. If the bar is .90m long and the clay is moving at 8.4 m/s befor estrikning the bar, what is the final speed of...

I need to calculate what percentage increase in impact strength I will get by inserting a 1" OD round tube with .083 wall inside a square 1 3/4" width tube with a .059 wall. Both are mild steel, ERW tubing. Check attached file for diagram. I can find out the tensile strength, if that is...

I have a question relating to astroid collisions with terrestrial planets. I was reading the Venus wiki, and linked to the wiki about colonizing Venus. One method for reducing the massive amounts of CO2 was a big impact on the planet, making the CO2 eject into space (if I remember...

When dropping a metal ball onto a foam mat what is the formula for the impact speed. I know the impact speed, rebound speed, the mass of the ball and time of the ball on the mat. I know: F = m[delta]v ...[delta]t and F = mg , where g= -9.8 N/kg But what is the...

Homework Statement A curious Physics student is inspecting A tower. He slips from a platform near the top and begins to fall straight down. Directly beneath him is an empty elevator at rest part way up the tower wall, and there is a set of control buttons on the platform from which he is...

can anyone tell me what the impact parameter represents in a simple scattering of particles?

I had an argument with a friend and fellow engineering student the other day about the properties of water in a high-speed impact. It started when I casually mentioned that water (like the new item from thinkgeek.com that we were discussing) exibits different properties at different impact...

Hi, I'm doing this investigation for school, and i came up with the idea of comparing the effectivenss of different matrials at absorbing impact. I have an idea about using a pendulum, where i release a bob of known mass at known starting height then let it hit the material. Thus, afterwards...

I'm currently finishing my phd in astrophysics and ill be 28.5 yrs old when i do so. I'm now looking for a post-doc job and it seems to be difficult. I've attended top undergraduate and graduate schools but seem to have no offers or call-backs on my applications.I'm being told that younger phd...

Is the only difference between these two impact tests how the specimen is held in position for the test? Charpy holds it like a simply supported beam, and Izod does it as if it was a cantilever?

Hello everyone, I am a senior physics student doing a paper on the pi meson. The only real website I can find with relevant information towards it is on wikipedia. I don't really want to use that as a source because of the credibility issue which arises with wiki. So I was wondering, (even tried...

I'm not sure if I'm posting this thread in the correct category, but I figured i'd give it a shot. If this is posted in the wrong category, i apologise. Some of you are probably familliar with the variable speed of light theory. It's something I just recently stumbled upon, almost by accident...

Next semester I am taking a class called Product Engineering and Manufacturing. It's a one semester course where we work with Dewalt tools. Luckily, we have the same tool as last semester, a cordless impact driver. We have to go through the process of finding something to fix on the impact...

If 1kg piece of steel hits steel surface with speed of 5m/s, how can you calculate the depth of the impact? Let's assume that the steel has 0.345 kN/mm2 material shear strength. Second question is that how much speed is needed to that same steel piece to penetrate 1cm thick steel sheet...

http://www.nrl.navy.mil/Review05/images/05Space(Picone).pdf Greenhouse Effect Could Cause a Space Problem Always focusing on the negative. :rolleyes: Actually, the positive benefit (have to reboost the satellite less often) is limited to only a few satellites, while the increasing...

In humans, what exactly will happen to a young teen if he/she does weed and alcohol? Like will their growth stop such as their sex organs and their height and whatnot, or will their brain stop maturing or what? Which of the propaganda is true?

Hi Basically, I am doing an A level project, in which I am investigating impact craters. I am modeling this by dropping ball bearings into sand, and measuring the depth and width of the resulting crater. However, my results are quite unclear, and I would really appreciate some guidance...

In what ways has the Bush administration damaged the US image abroad; potentially having made the world a more dangerous place? http://www.pbs.org/newshour/bb/middle_east/july-dec06/turkey_11-27.html

I'm supposed to determine if a bunch of materials have a high or low impact strength. I did the hard part and determined that the impact strength for each material, but I don't know a relative scale. What is a high value on the izod impact scale test(it's measured in joules). Any idea?

Hi, two wagons with elastic bumpers colide without any friction. Wagon A has the mass 0.1 kg while wagon B has 0.4 kg. After the collision wagon A has the speed 0.5 meters / second and wagon B lies still. Taken in consideration that the collision was elastic, what velocity does each wagon have...

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...

anyone help me out, please. can anyone tell me the "problems a cell would encouter if this structure ceased to function"?(what would happen, if Golgi apparatus did not exsist)

Small ice cubes, each of mass 5.30 g, slide down a frictionless ski-jump track in a steady stream, as shown in Figure P6.71. Starting from rest, each cube moves down through a net vertical distance of y = 1.40 m and leaves the bottom end of the track at an angle of 40.0° above the horizontal. At...

A 1.0 kg object is released from rest 500 km above the earth. A. What is its impact speed as it hits the ground? Ignore air resistance B. What would the impact speed be if the Earth were flat? I don't know how to start this. I said that v=sqrt(2G*M_e*m/(R_e+300))= 1.33*10^9 but that is...

Hi all, How does one calculate the point where impact of a moving object actually begins to move a stationary one, rather than just make noise? Let's keep it simple and assume the objects are of the same material, the stationary one is not anchored, and they won't shatter or explode...

Ok here's my problem: When I put a piece metal in a graduated cylinder filled with water to measure the metal's volume by "water displacement" I see air bubbles trapped under the metal. How do the air bubbles affect the density, mass and volume of the metal piece? Thanks. Need quick answer...

Please Help! I have figured out most of the problems for this assingment, however, I am having trouble with these: 1) A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 21.0 m/s. The cliff is h = 21.0 m above a flat horizontal beach. How...

Is this a realistic scenario for an asteroid impact, given the simulated physical dimentions of this mass? Video: http://www.spikedhumor.com/articles/34979/What_A_Meteor_Would_Do_If_It_Hit_Earth.html?autoplay=true"

is a delirium? 1) The photons was influenced by gravity? 2) I think yes, but the light don't lies on earth. 3)The light haves a energy which opposed to gravity. 4)A body with energy in opposite sense of gravity don't feel a speed of a container ( a jump in elevator or other) 5)The...

Has anyone heard of this? http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=39937" Jeez, I'm trying to decipher the website to figure out when to look.

Ball bearings are made by letting spherical drops of molten metal fall inside a tall tower called a shot tower and solidify as they fall. If a bearing needs 4.50 to solidify enough for impact, how high must the tower be? What is the bearing's impact speed? I got the answer for the first...

what causes high tide oppposite the moon?