Impact Definition and 911 Threads

Homework Statement A hammer slides 21 m down the side of the roof inclined at 60 deg. above the horizontal, and falls down to the lawn 11m below the edge of the roof. How far away from the wall will this hammer impact with the lawn? m = 1 kg mu = 0.23 Homework Equations...

If there is a patent that exists in the USA on a machine for example, is there any legal implication of using a similar variant of that machine in the UK? If the patent only exists in the US, then what is stopping it being coppied and patented across europe? Surely this would prevent the...

In another thread (see msg #17 of "Only dirty coal can save the Earth"), user Bystander suggested I lay out more carefully for critical examination the physical basis for the impact of CO2 on climate, so that the assumptions can be seen clearly. This is an excellent idea, and here is my attempt...

I jump off a high bench (5ft high) to the ground. What is the g-force of the impact and how do you calculate it. It seems mass is irrelevant for this Joe

Hello, can anyone help out in explaining what impacts highways could have on the ecology and what procedure and equipment one would need to go about checking them. I've never done anything on Earth science, could someone please help.

So I am taking like this new cs class offered at my school and it like infuses postmodernistic philosophy into the course as we go along. So we are reading **** by Voltaire, watching not just terminator 1 but the far superior terminator 2, the matrix 1 of course the rest you can just...

I would like to hear speculation about Apophis and its possible impact with the Earth in 2036. I am particularly interested in whether earthlings can change the orbit of Apophis if we need to. Is it possible to rendezvous with an incoming asteroid? How fast is this asteroid traveling?

Homework Statement A 11.2m long steel been is dropped from a height of 9.51m. The horizontal component of the Earth's over the region is 18.5x10^-6T. What's the emf in the beam impact just before the impact with the earth, assuming its long dimension remains in a horizontal plane, oriented...

Hey, I would like to design a lightning pole to be installed on the street (or in parking lots). The height of the pole is about 1m. I would like to calculate the impact of a car heating the pole in order to evaluate the damage to the pole (and to the car). I know the car mass...

A cart (m1 = 110 kg) is moving to the right along a track at v1i = 17 m/s when it hits a stationary cart (m2 = 390 kg) and rebounds with a speed of v1f = 7 m/s in the opposite direction. a) With what speed does the 390 kg cart move after the collision? I used conservation of momentum...

Homework Statement Using energy conservation and assuming negligible air resistance, calculate the impact speed of a 4.00 kg cannon ball after being dropped from a height of 55.0 m. Homework Equations KE sub total=KE sub 1+KE sub 2 speed=distance/time gravity=9.8 The Attempt at...

Homework Statement What is the speed of impact of electrons with the screen of the picture tube? Answer in units of m/s. Electrons are accelerated through a potential difference of 15500 V Charge of electron: 1.6 x 10^-19 C Mass of electron: 9.11 x 10^-31 kg Energy of electrons when they hit...

How much weight if any, should be given to public opinion to scientific theories that are, let's say difficult to prove, and could have significance effects globally.

Please forgive my ignorance on what may be simple topics for most of you. I'm just trying to get my head conceptually around a ball launching pet project I'm fiddling with. If you take a rubber (tennis) ball, say of 5 oz mass, and blast it with a sprung plate moving at 70 mph, will the ball...

If a cylindrical magnet with a uniform magnet field were to be rotated at high speed along its polar axis (assuming the poles to be at either end of the cylinder) would there be any change or distortion to the shape (ie pattern of field lines) of the magnetic field?

How big would an asteroid/comet have to be to impact the moon enough to have a significant effect on the Earth's ecosystem? Dust, tidal forces, etc. Thanks, -Mike

I'm a second semester sophomore right now majoring in Computer Engineering and things aren't looking bright for me. First semester, freshmen year, I got a 3.3 with one dropped class, chemistry. Second semester, freshmen year, I got a 2.8 with one dropped class, Calc 2. Both dropped...

I am looking to make a career shift. I am looking for a career track with the following characteristics: 1) Heavy use (and need to learn) advanced mathematical concepts (especially symbolic in nature). I want to be working with equations and logic in a symbolic manner on a daily basis. 2) A...

If you like to calculate, it can help you learn cosmo basics. Partly just by making it fun. Partly because it gives a hands-on dimension to what you are learning. If you don't find calculating basic cosmo numbers fun, then this thread is not for you. There are other less number-crunchy...

The solar wind is a stream of charged particles plasma—ejected from the upper atmosphere of the sun. It consists mostly of electrons and protons with energies of about 1 keV. These particles are able to escape the sun's “gravity”, in part because of the high temperature of the corona..so i have...

Ball Drop Impact test - equations?? I'm hoping someone can point me in the right direction here. =) I'm testing a bunch of materials by dropping a steel ball from increasing heights until the materials break. So I have a bunch of data that looks like this: Material A - broke at 18cm...

Hey everyone. I'm doing some impact testing, and I'm dropping a steel ball from different heights to test the strength of different materials. How would I go about finding the impact area of the steel ball on the surface? Thanks! edit: also, does area matter? would I be better off rating...

Homework Statement Two hockey puck of equal mass undergo a collision on a hockey rink. One puck is initiall at rest while the other is moving with a speed of 5.4m/s. After the collision, the velocities of the pucks make angles of 33 and 46 (degrees) relative to the initial velocity of the...

Hi, Hopefully somewone will know the calculation to find out the impact force for one person sitting on a chair and falling backwards with a full deaceleraton to a hard floor, what would the impact force be to the base of he head when stricking the floor. Chair is a chair with a bottom and...

Hello! At the moment, my collegues and myself have been asked to test some materials for their crush strengths. Unfortunately our dept. doesn't have a decent method for impact/crush testing, so we've come up with a modification to a Charpy Impact test. If you're unfamiliar, it's basically...

I am currently trying to work out if two objects, of given mass X and Y, (given in KG) are both traveling toward each other at Zmps, and collide head on, and come to a complete rest. how do i find the force of each object on impact. Without taking into account air resisitance. I'm aware...

Homework Statement A boy reaches out of a window and tosses a ball straight up with a speed of 10 m/s. The ball is 20 m above the ground as he releases it. Use energy to find: 1)The ball's maximum height above the ground. 2)The ball's speed as it passes the window on its way down. 3)The...

hi, i was just wondering... if a heavy truck collides with a lighter vehicle, and both are traveling at the SAME speed, would the force of impact be: the SAME for both vehicles, greater on the lighter car, or would the vehicles experience no force at all? thank you in advance for your...

(resolved) find the magnitude of the velocity vector on impact Thelma and Louise drive their '66 T-Bird convertible off a cliff. They are going 25.9 m/s and the cliff is 97 meters high. Find the magnitude of their velocity vector the moment they impact the ground. Make sure you do the following...

Homework Statement My problem has to do with impact parameter of two billiard balls. I don't want my problem solved persay, I just want to understand the problem, as I have a few things I am unclear about. If impact parameter is what "would've been the distance of the closet approach of the...

two balls are thrown with equal speeds from the top of a cliff of height H. one ball is thrown upward at an angle @ above the horizontal. the other ball is thrown downward at an angle # below the horizontal. show that each ball strikes the ground with same speed and find that speed in terms of H...

I am developing a new product. I am currently constructing various prototypes of the product changing only one component using a different material with each model. I want to test the impact results of each different model dropping a consistent weight (i.e. 20lbs) from a consistent height...

[b]1. I have to make an experiment which shows how mass and force affect acceleration. I have done an experiment for force(I have changed slope and rolled down a ball). Now I am not quite sure what to do for mass since mass is part of force! Is there a way that u can separate these 2? p.s...

Would being a part time student adversely affect grad school admissions?

http://news.bbc.co.uk/2/hi/business/7659086.stm I was wondering how this will affect the humans' migration and global culture (authority too) etc. It seems like China is getting ahead and migration flow will be reversed. I don't have enough data and knowledge to make any predictions but for...

http://www.snowballearth.org/could.html"

http://abcnews.go.com/Business/story?id=5835433&page=1

Homework Statement A golf ball released from a height of 2.02 m above a concrete floor, bounces back to a height of 0.86 m. If the ball is in contact with the floor for 3.57 ms( or .00357s), what is the magnitude of the average acceleration a of the ball while it is in contact with the...

Given the frequency of relatively minor asteroidal impacts, similar to the Tunguska event, it seems to me that ancient literature would be rife with stories of them, probably interpreted as acts of the gods or God. For example, in the Bible is the story (2Samuel 24 and 1Chronicles 21) of David...

Hello, In Power Quality, how does starting of large motor will cause voltage sag? How does voltage sag cause the motor to stall and overheat? A friend mentioned that it has something to do with sustaining the source power, but I simply don't get it. Thank you in advance.

For a real world problem, I've been puzzling over the trend to go after very light-weight rims for bicycles. My BS in physics hasn't provided me with solid answers. I am a bit rusty. I have found a feeling of increased stability when running heavier rims and attributed this to an increase in...

Homework Statement We have to do a project on finding out the relationship of velocity of the impact to crater depth by experimental methods, then we are supposed to find out the answer on the internet and compare it without experimental results. However, i couldn't find any website that wrote...

Homework Statement A 50lg man jumps off a bridge 80m high. He lands in choppy salt water feet first. Each foot has an area of 75cm^2. The goal is to find out a) What is the force sustained by the human body while hitting then decelerating in the water. b) depth of penitration Because...

this EurekAlert page links to a MIT press release describing the operation of the new catalyst and potential applications http://search.eurekalert.org/e3/query.html?qt=Nocera&col=ev3rel&qc=ev3rel&x=12&y=16 Dan Nocera is the main person responsible. Here's a ScienceDaily account...

Homework Statement A large fish traveling at 2m/s initially swallos at a smaller fish which is initially at rest. The large fish then, travels at a reduced speed. The large fish weighs 3 times heavier than the smaller fish. What is the velocity of the large fish and the small fish after the...

First off, i don't know if this is the right section for this, just thought i would try though... Here is my problem. I need a formula for impact force and duration when using spring pressure. I have the mass of the object in grams, the force of the spring, and the push length. Now i...

http://www.nasa.gov/mov/260502main_nir_green_blue2.mov You may remember Deep Impact was launched in 2005 with the mission of blasting a 370kg bullet into a comet. Now it has taken a remarkable video from a vantage point of 50 million km away of a spinning earth, complete with visible...

Hi there I have a question regarding the attom Not saying its possible but if it was what would happen to matter if you could slow the speed of the electron orbit? I am not into physics but very curious. Thanks in advance

There are two objects with the distance of r apart . because of the gravity , these two objects start to get closer to each other and then they get to each other (actually they fall on each other) .So my question is how long does it take for them to get to each other? Thank you

I once had a discussion with a Ph.D. at a university regarding global warming. His answer was interesting and something that I do not see addressed commonly in global warming discussion. He basically stated that when we change the biomass on a piece of land, such as a large tract of land and...