Impact Definition and 911 Threads

I attached the problem statement only with PART of the solutions. He is using the conservation of energy to find the velocity of the anvil. T=Kinetic energy V sub e=potential energy of the spring V sub g=potential energy of gravity The part I am not understand is how ΔV sub e =...

Homework Statement consider two balls of exactly the same size and material. Ball A is filled with air and ball B is filled with water.if dropped from a height of 100 feet,which will hit the ground first? Homework Equations U=mgh. The Attempt at a Solution i suggest the ball B will...

Ok so I am a professional freestyle skier who jumps off of cliffs into powder (light fluffy snow). I found a big cliff that I may go jump off and I know that it is physically possible to land and ski away from, but I also have an interest in physics, (with 0 knowledge), and I have been trying to...

I often hear about collisions in terms of impact force. For instance, "the boxer delivered a punch with 100 lbs of force." I have a pair of steel toed shoes that are rated to withstand 70 lbs of force (311 N). But if the shoe experiences an impact instead of being loaded very gradually, wouldn't...

The question really explains the primary question but I have another quick one as well. How come sound isn't measured in Joules if it is a form of energy?

Homework Statement A 0.211 kg shoe is dropped onto a vertically oriented spring with a spring constant of 102 N/m. The shoe becomes attached to the spring upon contact, and the spring is compressed 0.117 m before coming momentarily to rest. If the speed of the shoe just before impact is...

So I am finishing a physics paper that I am about to post on the web. Much of this paper involves the very same issue I have been thinking about in 2008 when my then-girlfriend, Jennifer, was trying to get me to participate in a dance class. I distinctly remember being in that dance class...

Hey, I'm struggling with this question, any help would be great. A sphere of mass m impinges obliquely on a sphere of mass M, which is at rest. The coefficient of restitution between the spheres is e. Show that if m=eM, the directions of motion after impact are at right angles My attempt...

http://desmond.imageshack.us/Himg843/scaled.php?server=843&filename=23518417.jpg&res=medium The crucial thing I'm not understanding here is how they know that after the collision (shown at the bottom of the picture), the horizontal velocities of each particle are reversed. Surely we don't...

I've been looking around for information on Saturn's moon, Titan, to present to my class. One thing that wikipedia seems to say about the moon is that it has distinctly fewer impact craters than other moons of its size and position in the solar system. Supposedly, this is attributed to some...

I'm not looking for someone to work this one out for me, and I know I have done this type of problem in entry level physics, but it's popped up again in dynamics, and physics is mostly a blur these days. Given the muzzle velocity and impact coordinates of a rifle, find the angles of elevation...

Homework Statement Two cars collide at right angle in the intersection of two icy roads. Car A has a mass of 1000 kg and car B 1400 kg. The cars become entangled and moved off together with a common velocity v’ in the direction indicated in figure QB4. If car A was traveling 10 m/s at the...

I hope I'm not asking too much. Other Driver hit Family Member. I want to calculate how fast OD was going. Desired results would be accurate to within 5 MPH or less. OD was in a 2003 Hyundai Elantra; googled curb weight around 2700. FM was in a 2005 Nissan Titan; googled curb weight...

Homework Statement Hello and thank you for reading my question. I am attempting to calculate what effect on a wall has an impact (a car impact or as in my theoretical calculations a punch) of an object into it. With effect I mean how strong impacts can a wall a, survive and b, stay...

Homework Statement A young student, dissatisfied with simply dropping fruit, decides to throw an apricot off a cliff. The apricot leaves the top of the cliff at a speed of 25 m/s and at an angle of 50° above the horizon. If the cliff is 310m tall, how far down range is the fruit when it hits...

I have been doing some calculations on a falling object and its impact force. We use heavy weights on our belt conveyors to maintain tension on the belts. One of our calculations relates to the amount of force placed on the structure that one of these weights lands on. I have the calculations...

Here's my situation... I have a loader dumping rock onto a proposed screening rack to separate stone sizes. The typical load is estimated at 4100kg and falls about 1m above the screen. My velocity at impact works out to about 4.4m/s just before impact (determined by SQRT(2 x 9.81m/s^2 x...

How big would an asteroid or comet need to be to say, disturb the moons orbit, either by impact or gravitational attraction? And would this significantly alter the chances of "Death From Above"? :)

some device or contraption to measure point impact velocity - ballistic pendulum ? i hope you guys and gals can point me in the right direction for a prototype i am working on. I am looking for a device that measures impact velocity. much like a ballistic pendulum only much sturdier than the...

Homework Statement A weather vane sits quietly on the roof of a barn on a calm winter's day. It has a length of x, is pole-shaped with mass M, and rotates frictionlessly about its center. But just now it is still. Suddenly Justin throws a snowball of mass m at speed v that hits it a...

Homework Statement So. I'm a muzzleloader hunter. If my rifle has a sight height of .85 inches. and groups at 25yards are 1.5 inches above 0 and groups at 50 yards are 2.5 inches above 0. The bullet I'm using has a ballistic coefficient of .205. The bullet weight is 240 grains. Is it possible...

Homework Statement 1. Homework Statement On a frictionless table, a glob of clay of mass 0.72 kg strikes a bar of mass 1.34 kg perpendicularly at a point 0.23 m from the center of the bar and sticks to it. If the bar is 1.22 m long and the clay is moving at 8.3 m/s before striking the...

If I know the mass of an object, the force of impact, how do i calculate the distance the object is from the impact point? i have a stationay object of known mass being hit with a piston at a known force and speed can i work backwards and determine at what height if dropped would be equivalent...

First of all, let me apologize for being a total math newb. I love geometry but I barely made it out of algebra alive...and that was 21 years ago. My girlfriend was recently involved in a car accident where she was charged with "Failure To Yield". Based on a spectacularly non-stellar...

If you went back in time and brought with you modern day devices, could you teach the people of that day (to a certain extent) how to create and use these devices? What impact would this have the modern day? Would we be more evolved?

I used some formulas to determine the impact force of a bubble wrapped 1kg object dropped 1 meter and traveling .03m after impact. But I need some help with the next part. What if an identical bubble wrapped 1kg object is placed on top and both are dropped at the same time? Will the wrapping...

I'm doing a physics assignment on safety devices such as helmets and i need help with a question. Why is the Impact force reduced for a helmet with a soft interior VS a hard interior? I know it is because the soft padding on the inside of soft the helmet will reduce the time taken for your...

I have searched online and found that the power of a punch P=Fv, where F is the force of the punch and v is the speed. But in my mind it works like this: let's just say that only the arm speed is taken into account, then before impact, the energy of the arm traveling is E=(1/2)mv^2. That is how...

Homework Statement vinit = sqrt(2g*h); h = drop distance vfinal = 0; xinit = 0; xfinal = 100mm; a = g; Issue: non-linear damping. M*x'' - b*(x')^2 - k*x = 0; b = 128*mu*(length fluid travels)*(D^4(piston)/[(D(hydraulic)^4)(orifice opening)]every book I've been reading on vibrations damping...

Homework Statement Mobile phone is dropped onto a hard floor from a height of 1.5m. The mass of the mobile phone is 0.2 kg. After the impact, the phone bounces to a maximum height of 50 mm. The phone is estimated to be in contact with the floor for 0.005s. Which is of the following is the...

Homework Statement Force exerted on a car by a crash barrier as the barrier crushes is F=-(4.5+140s) kN where s is the distance in metres from the initial contact. If a car of mass 2000 kg is traveling at 100 km/h when it hits the barrier the barrier deformation required to bring the car to...

If you had a cannonball made that was 5 pounds in weight and it hit a brick wall at a speed of 1,000 miles per second at the point of impact, how many pounds of pressure per square inch would the cannonball exert on the brick wall?

Does a spark gap increase the current in a circuit? My thinking is that the surrounding air is ionized and any "stripped" free electrons would add to the current.

This one is actually for a lab assignment. In the experiment you shoot a jet of water upward vertically at a variety of targets with different geometries (a flat plate, various cups). The target is suspended from a rod, and on top of the rod is a cup where you can add weights, held up by a...

(Q) a 108 cm, 0.73kg golf club is swung for 0.5s with a constant acceleartion of 10 rad/s (squ). What os the linear momentum of the club head when it impacts the ball? Known: H= 108cm = 1.8m m = 0.73 kg =7.16N t = 0.5s \alpha= 10 rad/s (squ) I know momentum = mass x velcoity So...

Homework Statement For a lab in Physics C, we're supposed to find the muzzle and impact velocity of a dart gun. We found x-distance, y-distance, and angle fired at, however, we were not allowed time. Our teacher wants us to graph data that is important, but I don't see how a graph would be...

"For a pure substance, melting occurs at the same temperature as freezing." Does it means that if impurities are added, then the melting point of the substance is not at the same temperature as freezing ? If yes, how you would explain this ?

In the Rfc about MOSPF, is declared that one difference between this alghortim an his "unicast version" OSPF that, while in the former what is important is both the source and the destination, in OSPF what is fundamental is just the destination. Why this statement, if in both case source is...

Homework Statement This is not a homework assignment, its more of a personal project. An object (Mass undecided yet) is launched from the North pole of Mars towards the North pole of Sun. It is assumes that Sun, Earth and Mars are in a perfect linear alignment in front of one another and that...

The Great Chicago Fire of 8-10 October 1871 has inspired many theories as to its origin, one of which involves extraterrestrial origin. I'm here referring to the theory that the Chicago Fire, together with several other nearly simultaneous major fires in the region of Lake Michigan and...

I am trying to determine the maximum (instantaneous) impact force experienced by an object when it is struck by a hydraulic ram. I know both the pressure in the cylinder side of the ram and the level of deceleration (-g) experienced by the end of the rod on the ram when it stikes the object...

Here is a question for the physics experts. Some people been debating about the impact force on a bike of a bike rider riding off a 6 foot drop to a flat landing. Mainly the debate is about if speed would lessen the impact force on the bike because of the impact angle. So, if a bike rider...

When a ping pong ball strikes the ground obliquely without spinning, the angle of incidence is not equal to that of reflection, am I correct? Here is my thoughts: Assume the ground is smooth and negligible air resistance. When the ball touches the ground, it starts to deform, delivering its...

Good Afternoon, all... I am trying to locate software or explanation of what happens when a thrown object hits a stationary object. Specifically, how to determine what will happen when a professional pitching horseshoe hits the stake. I am trying to determine how the shape of the shoe and...

Homework Statement http://i.imgur.com/CnAcu.png Homework Equations So, I'm having trouble figuring out how to start this problem. I'm trying to use this equation: Fe = W(1+\sqrt{1+2h/\deltast} and \deltast = W/k The Attempt at a Solution This is my attempt at summing the forces...

When a cue ball is driven into another ball, it is either not accelerating or decelerating at impact. It has momentum but not (positive) force. What (work?) is imparted to the struck ball, and in what units of measurement?

Does anyone know the impact factor of SAE journal? thanks

Quick question - Is it that the bigger the space in between two bodies makes bigger room for more dark energy to allocate more force, making the two bodies distant of each other faster than the bodies such as me and my friend standing a meter away from each other?

what is magnetic field and ? how it forms ?

Could someone please give me a plausible impact energy of a very small (maybe .1 or .2 meters diameter) meteoroid hitting the earth. This does not need to be exact at all. I just would like an extremely rough estimate of a possible energy of impact. For example, larger meteoroids (i.e, 7-8...