Impact Definition and 956 Threads

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.

I want to calculate the deformation of a plate of a material upon being struck by a mass moving along the plate's normal, and if the impact force is sufficient, if the plate will break or not. The given information can be assumed to be: mass, velocity, and contact area of the mass, and the...

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...

Hello! I would be very happy if someone could give me a little advice or a hint about my problem. The problem: I have to analyze the impact (colision) of two rotating bodies around a separate fixed axis. The body #1 hits (when rotating) the stationary body #2, then they both start/continue...

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...

If a meteor entered the Earth's atmosphere at 11 or so km/sec and impacted the Earth with a direct hit (by impact time it is 4 kg), what would the force of impact be? I only need a rough answer.

I posted earlier about testing a project to simulate a wood 2x4 traveling at 67 mph, I did not really get the answers I was looking for so I am going to try to rephase it. My project needs to withstand the impact of a 15lb wood 2x4 traveling at 67 mph. I want to simulate this test but in a...

I was wondering how much energy it would take to melt a big enough asteroid considered to be dangerous? Is it even possible? If possible, could it be done fast enough before it impacts? If it is completely melted can it then be somehow dispersed so that it turns into smaller chunks that...

"End the R-word" What you do all make of the campaign to end the usage of the word "retard"? I understand their motivation (to prevent emotional damage to those it offends), but I can't help but think another word will just replace it.

What is the crater size for an asteroid impact as a function of the asteroid diameter? Are there any estimated function?

1. How do we know EM radiation is a wave? Also, how do we know that the magnetic wave is exactly orthogonal to the electronic wave? 2. In the into to A Brief History of Time, SH says that wave-particle duality refutes determinism. How is that conclusion made?

The following excerpt is taken from a Swiss Federal Nuclear Safety Inspectorate (HSK) publication[1]: “In the year 1988 a large scale crash test was performed at the US Sandia National Laboratory in which a Phantom military jet with a weight of 19 tons was impacted at a velocity of 774 km/h...

Please be gentle, I'm not a physicist, I'm a podiatrist trying to find the answer to a problem that has been confusing me! I hope you can help. In podiatry we often use foot orthoses in an attempt to alter the magnitude, location and timing of reaction forces at the foot's interface. A...

Homework Statement Suppose an asteroid of mass 3.9e21 kg is nearly at rest outside the solar system, far beyond Pluto. It falls toward the Sun and crashes into the Earth at the equator, coming in at an angle of 30 degrees to the vertical as shown, against the direction of rotation of the...

I have to fix the connection tag to PCB by using pneumatic jig. The material of connection tag is brass.

The angle of impact along with the mass and speed/acceletation have been claimed to be factors responsible for the depth of a crator. How importat a factor is the angle of impact? are the mass and speed/acceleration more important factors? How much influence will the Earth's rotation have on...

I have a simple question for you but a difficult one for me. My bicycle rim manufacturer tells me that the carbon bicycle rim brakes at 900 pounds of pressure. If we have a cyclist of 300 pounds riding at 30 mph and he hits a pot hole for example. What is the amount of pressure/force he...

Not long ago I was arguing with someone on the Internet (where everyone is wrong) about impact of quantum effects on macro scale objects. Imagine ice-hockey table (one with almost no friction) with number of pucks on it. If you'll hit one of them it is safe to say that pucks' paths are very...

Homework Statement A medieval prince trapped in a castle wraps a message around a rock and throws it from the top of the castle wall with an initial velocity of 12 m/s [42 above horizon]. The rock lands just on the far side of the castle's moat, at a level 9.5 m below the initial level...

My book is talking about how collisions can be very different, basically saying how altering the time of contact affects the force. It then gives an example: "Consider a ball of 200g colliding with a hard floor and a trampoline. Before the collision, each ball travels downwards at 10 m/s and...

Homework Statement A 2.0-mm-diameter plastic bead is charged to –1.0 nC. A proton is fired at the bead from far away with a speed of 1.0 x 10^6 m/s, and it collides head-on. What is the impact speed? Homework Equations Conservation of energy: Kf + qVf= Ki + qVi Possibly U elect/ Electric...

Homework Statement A blue whale materializes 11.5 km above an airless planet with an acceleration of gravity of 6.85 m/s2. What is the speed of the whale right before impact? Use the work energy theorem. Homework Equations Work energy theorem : W = the change in k W=kf - ko w=1/2(mvf2)...

I was watching this charpy impact test video clip - I fail to understand 2 things. A) Why do they cool the metal with liquid nitrogen before they test it? It seems wasteful. Set the standard testing temperature to 25 degrees instead. B) What happens to the metal after it gets hit? Does...

Hi, I am doing question A2/15 B2/23 (specifically part (ii)) at the top of page 50 here: http://www.maths.cam.ac.uk/undergrad/pastpapers/2001/Part_2/list_II.pdf I have done everything up to and including showing the impact parameter is given by b=h/E, but I am having trouble doing parts (a)...

I was solving a projectile motion problem and was wondering if, while going downwards, an object's final y velocity can be less than the initial y velocity. If this is true, would this change the time until it hit the ground? The only reason I was thinking about this is because if x/v = t. If...

I've been trying to figure this out for a few days now and I hope someone can help me out...If an object is lifted 1m above the rigid ground and then it is dropped. What would be to force experience (in Newton) by the object if: - You don't know the exact distant or time for the object to come...

I'm trying to design an impact testing rig and i need to use the currently existing chemical explosion rig as one of the solutions alrady existing in my report. But i can't seem to find very much on this, any help would be greatly appreciated. thank you

Homework Statement Why does a car uses more fuel with lesser air in tyres? Homework Equations Work done =F.d The Attempt at a Solution According to me Friction does no work in rolling if the tyre is purely circular. But when tyes are deflated then they are not circular. Due to...

Okay, so I understand that galaxies spin more like a frisbee than the solar system, and that there is evidence for a lot of non-light-emitting mass (such as gravitational lensing) but how would dark matter account for the difference in the spin of galaxies? Gravity still decreases inverse to the...

Homework Statement A pipe end stop fails when subjected to high pressure and flys of the pipe before impacting with a polycarbonate protective screen. The end stop has a mass of 100g and is 12.7mm dia. as is the internal diameter of the pipe. The instantaneous pressure that the end stop fails...

I have noticed that during traumatic events say, car crashes, Although the crash duration is less then a blink of an eye, it feels like takes much longer. I think horizon covered a research of time dilation perception that failed.* Anyway is it possible incredible powers of the crash increase...

Im making a simulation of ball physics... As the title says i have a problem with friction. So i have a ball with radius, mass, speed... And the ball hits a wall with some speed on an angle. i calculate horizontal and vertical speed in relation to wall with sin and cos...(i need actuall...