Impact Definition and 956 Threads

Homework Statement A ball is thrown at a velocity of 10 m/s, at an angle of 30° from horizontal and released 2 m above the ground. What will the magnitude of ball’s resultant velocity be at the moment of impact with the ground? Homework Equations Vf2 = vi2 + 2as The Attempt at a...

The month long debacle over the BP oil spill, and earlier collapse of a coal mine killing scores of coal miners, makes me wonder: what are the risk to human safety and environmental impact for mining, processing nuclear fuel (i.e uranium, thorium) ? Could acquiring nuclear fuel lead to a...

Remember those executive toys that were popular in the '80s? You have a steel ball on the end of a thin rod hitting another steel ball that is stationary. As near as we can see, the target ball gets all the momentum of the moving ball, and the moving ball stops dead - close to 100% transfer. But...

So I checked out the physics class I was taking on ratemyprofessor.com and John Ross was the guy who was teaching it. He had good reviews, so I figured I'll take his class. Well, a TA is teaching it, and I won't name the person, but he isn't really a teacher--even with his PhD in astrophysics...

Homework Statement A 4-kg projectile travels with a horizontal velocity of 600 m/s before it explodes and breaks into two fragments A and B of mass 1.5 kg and 2.5 kg, respectively. If the fragments travel along the parabolic trajectories shown, determine the magnitude of velocity of each...

Why?? Why does the time affect velocity in this case not force (as in first case)? Thanks

Homework Statement This is an output of a c program example given by my professor. I have written a program that makes it as far as calculating everything but impact. I have all equations figured out except for how the time of impact was calculated. Enter initial magnitude (0 to 250...

I have wondered how vulnerable is the Space Shuttle to an impact by a small meteor. If a golf ball sized or even a marble sized meteor struck the shuttle, isn't there a very strong possibility of puncturing the shuttle? Would a small hole in the shuttle be catastrophic, causing all the air to...

Hi there, For my Final Year Project at University I am analysing Road Restraint Systems/Safety Barriers in a Finite Element Analysis package. My problem is calculating the force exerted onto the barrier by a vehicle during a collision, more specifically the time over which this impact...

Trying to calculate the impact of an 8000 lb. truck moving at a rate of 55mph, hitting a 200 lb deer that is standing still in the middle of the road. Does assuming it is a localized hit make any difference? What i mean is, if the deer was hit from the back, and his 200lb wieght was focused in...

I'm sure I'm not thinking of this the right way. I'm hoping someone can see the error in my logic. Should a force have less of an impact on a moving object than one which is at rest? An object which is in motion has a momentum given by p=mv. A force F acting (say in the opposite...

probably a dumb question but could a comet or asteroid impact ever create a mini wormhole or mini black hole or the like? also what's worse in terms of impact damage? - a comet, asteroid or meteor? thanks

How do free electrons (metals) impact reflectivity. Why are they more reflective than another surface without free electrons (valence). Does this mean that a medium with no valence electrons will be 100% non reflective. Thanks

Hi, I am currently studying Microeconomics and am a little stuck on a question. It is in relation to a 'consumer subsidy' provided by the government, my textbook does not cover it and I have been unsuccessful locating anything online as it all seems to be about a producers subsidy; which our...

A derivation of the capacitance for a parallel plate capacitor is as follows: [ assume uniform field, plate area is infinite in relation to the separation, the conductors are perfect conductors ] So, V=Ed where V=voltage difference between plates E= electric field (uniform)...

mobile "lights" I have seen some light making stickers sold that can be put on your mobile and they emit light when you talk. Am I right that they will lower my chances of getting connected when I am far from the antenna? I mean they must somehow make signal weaker, don;t they?

1. An asteroid of 1.0 km diameter will make a crater of about 10 km diameter. How much kinetic energy does the asteroid have if it strikes the surface at about 20km/s. Convert answers to megatons of TNT; 1 megaton = 4 X 10^15 Joules. 2. I do not understand how there is enough...

Homework Statement A Bullet of ice at a temperature of 0 degrees celieus is fired into a target Assuming that all the impact energy is retained by the ice what impact velocity is needed to melt 68% of the ice Homework Equations 1/2mv^2 Q = ml The Attempt at a Solution i got.. v^2 =...

I am trying to run a finite element analysis for a collision impact. The program I am using is MD Patran/Nastran. My model consists of moving object colliding with a stationary object. I have created the mesh, applied the appropriate material, applied the boundary conditions (fixed for the...

I'm in a second year physics course, and were studying Rutherford scattering. I'm not having any trouble with the physical or mathematical concepts, I'd just like a more precise definition of the phrase "impact parameter". I searched google, and my notes and textbook but couldn't really find...

Could it be that we are keeping all pets in their baby/infant state, psychologically? Hypothetically, if talking apes were capturing human babies and keeping them as pets (as in Planet of Apes) like we keep cats as pets, the apes would neuter/spay the human children, feed them corn &...

Homework Statement Object is moving directly toward earth initial V = 2000 m/s distance from center of Earth = 8 X 10^{7} m Determine speed at impact Homework Equations g = \frac{GM}{R^{2}} The Attempt at a Solution I am guessing I'll need to integrate to get velocity, but am not...

So a friend and I started a debate over dinner, and no-one around here really wants to side with either of us, since neither of us has any concrete facts on the issue. The issue is this: Which would have a greater chance of causing a fatal impact on someone, a wooden bat or an aluminum bat...

I recently received a speeding ticket for "allegedly" driving my scooter (Piaggio MP3 500) 72Mph on a stretch of road with a lower speed limit. I was traveling too fast and I deserve to pay a penalty; however, I am also hoping the judge will recognize that a speeding scooter is less potentially...

URGENT:Sources of Error that Impact the Percentage Yield So my question is: 1. What sources of error in the experiment would affect the percentage yield of reaction? 2. In what ways this experiment could be improved...

Homework Statement After falling from rest at a height of 29.8 m, a 0.422 kg ball rebounds upward, reaching a height of 21.7 m. If the contact between ball and ground lasted 1.83 ms, what average force was exerted on the ball? Homework Equations Change in momentum (p) = Fnet* Change in...

Homework Statement I've seen this problem on here only twice, once never answered, and the other just saying the OP's "solution" was on the right track Problem: You are arguing over a cell phone while trailing an unmarked police car by 37 m. Both your car and the police car are...

I need help with some physics questions. I need to know how to figure the force that an object falling on an arc would strike someone. The object is a solid steel door mounted horizontally. The door is 68 1/2 in. wide and 15 in. tall. It is mounted at the base and weighs 45.39 lbs or 20.59 kgs...

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

Hi all, have been wondering, why is it that when you put your hand in water, it's soft and there is hardly any resistance, but when you jump into it like from 100m above, you will most probably kill yourself? Is it because there is not enough time for the forces to distribute across the water...

Would anyone only help me to compare the impact or damage of a Futsal ball against a wall versus a basketball ball. We have a new sport growing in popularity in the USA named Futsal. This sport is very popular worldwide and should soon become a Olympic Sport. In a few words, Futsal is soccer...

i'm trying to calculate the impact force of a slide hammer under water. i can calculate it in air using (mv^2/2d), from work energy principle info i got off the net. and i have formulas for calculating drag; (0.5CpAv^2), also off the net, which i believe i have to account for? but no idea how to...

There is a standard impact test that is used in the fenestration industry. An air cannon is used to fire a piece of lumber at the unit being tested. The mass of the 'missile' is 4.09 kg. The velocity of the missile is 15.26 m/s. I am wondering if there is a way to approximate this test...

calculating impact force?? I need help calculating impact force. Here's all the information I have: the object weighs 180 pounds being dropped from a height of 11 feet I'm not completely sure if the force can be determined from that. I'm having a hard time figuring it out for some reason.

I want to mount some type of measuring device on a remote control car, and then crash it into a wall. As a result of the impact, I want to look at the speed the car was traveling at point of impact, as well as the rate of decelleration that occurred after impact (using various bumpers). I think...

Hi, I have a basic question that i would be very thankful if someone could help me answer. I need to find out what the weight of impact is from an object of 40kg that falls 50cm. Many thanks. Jeanette

I'm trying to think of a way to measure the force of an impact on an object (I think it would be the normal force...?) using experimental data only. Because of that I'm restricted to not using time, and I can't think of how else to calculate the force. Is there an equation that can get me started?

Homework Statement the question goes like this a man of mass 70kg falls onto a rescue cushion from a height of 7 m he comes to rest 0.2s after he reaches the cushion the cushion is 2m high when inflated a)find the impact force acting on him (take the weight of the man into...

3. Suppose a meteorite collides with Earth with a force of 6.41*1012N. A. What is the mass of the meteorite if it's impact speed is 10 km/s so that it has an acceleration of approximatley -1.00*108 m/s2 I know I want to use an equation from Newton's second law but what equation do I use...

So I'm working on an article about the imapact resistance of ophthalmic lens materials. The two main lens materials used are those of a hard resin called CR-39 and the other is polycarbonate. I have been looking for something that describes the difference in their ability to withstand certain...

I'm a 1st semester sophomore math major right now and I'm taking an Intro Topology course this semester. It ended up being harder than I expected it to be and I'm fairly certain that I will end up with a B/B+ (most likely a B+) in the course due to one bad exam. How bad will this look when I'm...

Homework Statement A 4.7 kg block is placed on an incline with a 14° angle. Ignoring friction, what is the acceleration of the block? If the coefficient of kinetic friction is 0.25 (and has overcome static friction) what is the acceleration of the block? If the incline is 4.6m long, what is the...

Homework Statement Note the picture... An ice hockey puck with a mass at 0.20 kg has a velocity of 12 m/s before being struck by the hockey stick. After the impact the puck moves in the new direction shown with a velocity of18 m/s. If the stick is in contact with the puck for 40 ms...

Mitch throws a 100 g lump of clay at a 500 g target, which is at rest on a horizontal surface. After impact, the target, including the attached clay, slides 2.1 m before stopping. If the coefficient of kinetic friction is \muk = 0.35, find the speed of the clay before impact. I don't know...

Hello, My 7th grade son has selected a science project which requires to find the impact of two toy cars crashing as part of the larger project. To keep it simple, he will keep one car fixed (i.e. not moving) and the other car crashing into the fixed car at varying speed. I have suggested...

Homework Statement can someone tell me how to go about this question please; we are trying to get the force of impact if a man hit the bonnet that is stagnant(the car is not moving) the man is in front of the car and also the pulling force if he tries to forcefully pull the door handel...

Homework Statement As part of a forensic experiment, a 50g bullet is fired horizontally into a 2.0kg wooden pendulum. The pendulum with the bullet embedded in it rises 15cm vertically from its initial position and stops. a) Calculate the velocity of the block and bullet just after the...

I am trying to calculate the difference in force between a body standing still on the Earth's surface and that same body falling from a distance of 2.7 meters (approx 9 feet). Specifically, I am trying to determine what percentage increase in force is attained by this fall. Thank you.

What is stack effect in cmos design and how would it affect the threshold voltages?

Has anyone got any good break down on what happens during and impact. I am using my example of Chicxulub I've seen the wikipedia and there is a good animation on there has anyone know where i can find some still diagrams ?