Impact Definition and 956 Threads

Hi all, I am trying to calculate a value for stress in a right angled bracket. this would be simple for me if the load was a static load, it would cause the bracket to bend around a point etc so i can get moments to find its bending stress. however this bracket will be stopping a moving...

I haven't got my grades yet, but I wouldn't be surprised if I'd outright failed one of my January exams and not done particularly well on 2 others. (Took 5 in total) I know the reason this happened, but I won't go into it because its a bit of a story. I also know a typical physics degree of...

Hi, I am trying to calculate the impact force of a rubber weight falling on a rubber surface. I am aware that to calculate impact force, I need to know the amount of deflection after impact. Is there a way to calculate this, using material parameters, rather than experimentally? Thanks in...

Why, in terms of Physics so forces etc... does the diameter of a the splash from a raindrop increase when the height is also increased?:confused: Thanks (:

Homework Statement A mass of 150 KG is dropped onto a pile of mass 1,200 kg from a height of 2.5m and drives it 7cm into the ground. calculate (a) the initial veocity of pile and driving weight immediately after impact, (b) the average resisting force excerted by the ground. Homework...

Is it possible that the chicxulub impact is responsible for the Earth's magnetic pole being tilted 15 degrees off the Earth's axis? If so, at what angle would the impactor have to have struck & based on that and the Earth's current angle can we estimate not only the approximate day of the year...

I am aware that the LHC accelerates subatomic particles to just under the speed of light then smashes them together. However, at the time of collision, would this mean that the combined speed of the impacting particles is almost two times the speed of light? Or are the particles individually...

I'm feeling so frustrated that I typed out a whole detailed write up & it got washed off. Damn it. 1. How does gravity dilate time? I've been trying to get a conceptual answer that is easy to understand, for I have no background in physics whatsoever & am reading up out of interest. Today...

Hi my question is : Moving the body mass was affected in 5 KG force of 20 Newton in a counter direction to the direction of movement if the speed 4 m / s. Calculate the time of the impact of this force is it right? pi= mvi = (5)(9)=40 kg.m|s pf= mvf = (5)(-4)=-20 kg.m|s t = (pf - pi)|f =...

I am constructing a piece of sports equipment that requires me to know the amount of pounds of force the ball impacts on the equipment with the ball weighing 55 grams traveling a maximum of 75 mph a minimum distance of 10 feet or a maximum of 50 feet. the ball is 5.5 inches around when measuring...

Please can anybody explain why Impact testing is carries out @ -20 degree or @ lower temparatures. & what will happen if it is conducted @ higher temp. Please elaborate.

Pretend there are two accelerating masses connected to a massless string with a frictionless pulley between them. How can the frictionless pulley (Rotational inertia and radius given) affect acceleration in any sort of way? Also, why is the net force equal to Acceleration * (Mass of two...

Well I've searched this forum and didnt see this topic before, so I was wondering what the general consensus is on the impact of Godel's theorem (if any) on a possible TOE? I'm still wading through it all so just wanted some other opinions...

Hi all, Doing a project for 1st year special topics physics module in university and we're thinking of doing the project on stars. Just wondering if anyone might know of any good literature on the sublject that we could look into as part of our research. We have until mid January to do the...

Homework Statement For alpha particles of 7.7 MeV, what impact parameter will result in a deflection of 2 degrees for a thin gold foil? Homework Equations impact parameter equation, b=\frac{kq_{\alpha}Q}{m_{\alpha}v^{2}}cot\frac{\theta}{2} The Attempt at a Solution Pretty easy, just plug...

Homework Statement From the given picture, we know: VA before collision VB before collision the radius to the center of mass of each car from the collision point P e the masses of both the mass moment of inertia of both We must find the velocities of the centers of mass of each car...

Okay. Well I'm in high school and I made an account on this forum to see if I can get some insight on an interesting phenomena my teacher showed me. He asked us which way a tennis ball would bounce if he bounced it on the floor at an angle and let it hit the bottom of a table, and gave us...

Homework Statement [PLAIN]http://img87.imageshack.us/img87/9964/impactforceonbike.png A roller is rolling with a constant speed before and after the drop. How do i figure out the impact force exerted on the wheel when it just touch the floor from a height h? Assume, angular velocity...

Homework Statement Hi A little help will be appreciated (a)Double slit interference fringes are observed using light of wavelength 590nm abd a pair of double slits of spcing o.50mm. The fringes are observed on a screen at a distance of 0.90m from the double slits. Calculate the...

Homework Statement A 7g bullet moving horizontally at 200 m/s strikes and passes through a 150 g tin can sitting on a post. Just after impact, the can has a horizontal speed of 180 cm/s. What the bullet's speed after leaving the can? ANSWER = 161 m/s Homework Equations 7g = .007 kg 150 g...

Well I'm 25 years old, and am currently in the middle of a major career change, going from consulting to physics. Now for me my age isn't a problem, i feel motivated and am ready to bust my :blushing::blushing::blushing: for this. However, I've been wondering if it could be a problem for...

Homework Statement An 1800kg car traveling north at 35 km/hr collides with an 1100kg car traveling east at 45km/hr. The cars stick together and skid to a stop (a) what is the velocity (speed and direction) of the two cars immediately after the collision? (b) How much kinetic energy is lost...

Homework Statement Consider two less-than-desirable options. In the first you are driving 30 miles/hr and crash head-on into an identical car also going 30 miles/hr. In the second option you are driving 30 mph and crash head-on into a stationary brick wall. In neither case does your car bounce...

If an average adult male fell from a bridge (ex. golden gate) what would be the impact on his body when he hit still water versus water with waves. What is his acceleration, momentum, and his change of momentum when he hits the water With these in mind how does the fall affect his organs...

Hi guys. Which one has more impact toughness: GFRP or Steel??

Homework Statement I'm doing a catapult project and I have to calculate a few pieces of information. The initial velocity of the release (horizontal and vertical components) , the time of the highest point, and velocity of impact of the object. I know how to do all of these except find...

first of all I have a case that is screwed in another case ,I like to know a basic way to calculate the impact force in the screws ,the are 16 screws, I try using the basic impact force formula and the conservation of energy in the free fall,but I am having problems since I don't have the D...

I am trying to model the following situation: Let say i have an obstacle with known mass, and I know the coefficient of static and dynamic friction between the obstacle material and the floor. A car traveling at a fixed velocity is to impact the obstacle. For simplicity i will first consider...

what is a the difference between a static and a dynamic impact?

1. Show that the gravitational force between two planets is quadrupled if the masses of both planets are doubled but the distance between them stays the same. 2. F = G m1m2/d2 ?? 3. confused...

Hypothetically: If a hollow sphere with a human inside were placed exactly at the centre of the Earth's core; then how would gravity affect the human (or any mass for that matter).

We know that we, as humans, with our free will, can alter/impact our earthly world, and to some extent, our solar system. How much **possibly** we can impact/alter our part of the galaxy and/or universe? Is there any role for free will in the continuity of the universe? Just wondering if there...

Momentum And Direct Impact. Subtopic: Impulsive Tension. Help.. 1. The problem statement, all variables and given/known data Three particles A, B and C all of mass m rest on a smooth horizontal plane so that angle ABC is 120 degree. B is connected to both A and C by light inextensible...

If an infinitely large rock is traveling infinitesimally slow along a straight line and an infinitesimally small rock is traveling infinitely fast towards the infinitely large rock along the same axis, is the collision elastic?

Hi, this thought came to my mind..not sure how correct this is. In extreme gravity, the space curves. Will the value of Pi change in this case, for a circle near such gravity ? pi = circumference/diameter.

A golfer drives a ball with initial angle θ = 45 from a tee at the origin. The ball hits a window at height h = 10m a distance D = 80m away. a. Find the initial launch speed v0 of the ball. b. Suppose a second golfer tees off from the same spot at an unknown angle and speed, and...

I need help in these two problems. 1. Fernando Jose hits a 0.05 kg golf ball, giving it a speed of 65 km/s. What impulse does he impact to the ball? 2. Automobile companies often test the safety of cars by putting them through crash test to observe the integrity of passenger's...

Would a ball dropped vs launched(horizontally) have the same force of impact? (same starting height) I can't wrap my mind around this... I know there's no acceleration in the x-direction, yet I would imagine the launched object would have a greater force of impact. (negating the ball rolling...

"Blended metal" bullets; much heat after impact? Can anyone tell me? These bullets supposedly will penetrate body armor, but not drywall, and are alleged to pretty well explode when going through flesh. I've read a report by a contractor who used one in Iraq and said the soft tissue damage...

Trying to calculate this for work. Have 160,000 lbs drop 45 ft with mud weight of 16.5

let me explain i do a static tensile test and get the stress strain graph. the area under the graph is the toughness that means i can use this static toughness data to predict the failure under impact loads other idea is that i have done a impact toughess test. if i can get the...

Hello, the professor supervising my bachelor thesis is happy with the results. Together with another co-author, he is currently writing a paper for Physical Review Letters and is considering adding my results to it. However, for this purpose, he needs more general results. In other words, if...

We observe farther galaxies with higher redshifts. How can we be sure that this is due space itself expanding? How do we know that this is not just Doppler shift of galaxies running away from us at higher speeds long time ago, that got lowered (decelerated by gravity of matter in the...

Homework Statement Hello! I have a problem to calculate the equations of impact (not elastic) of a chain of links. The goal is to have joint velocities of the links after impact. I know how to do this without a dependent variabele, see my attempt in...

http://www.usnews.com/articles/education/paying-for-college/2010/07/12/most-public-colleges-face-budget-cut-threats-in-2011.html Okay so I'm thinking that these budget cuts might reduce the number of graduate students many of these universities can take. And as a result, they might make...

Homework Statement Two oppositely charged balls are hung by strings from a wooden dowel. The two balls are separated by a distance of R. a) If the balls are moved along the dowel until their separation is 3/2 R, has their potential energy increased or decreased? b) What is the...

Homework Statement Problematic Part of the problem: Consider a negative ion beam of He- ions. The given beam characteristics are the beam energy (E) and the beam current (I). An electrostatic chopper is placed on the beam line, which pulses the DC beam with a pulse width of say t_1...

Hi I was just wondering if anyone could please help me, I was just wondering what would happen to the supply curve if; 1. There was a recession. 2. And if oil prices increases. what would cause the supply curve to shift? thanks heaps for your help Mel

when approaching C the mass of your craft increases. If the mass of your fuel increases also wouldn't that mean the faster you go the more fuel youll have?

Science is not immune to fads. Fads are strengthened by media and institutions entrenching details and hindering objectivity. Examples of what I would consider fad science are, global warming, string theory, quantum realities, a tone of stuff related to nutrition, dieting and health.