Impact Definition and 911 Threads

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 ?

I have been out of school for a few years so my physics is rusty. I need help figuring something out for my job. I need to know how high I must drop an object so that it hits the ground with an impact of 1000g's. The object is a cylindar and weighs 2lbs. I have been confusing myself. I...

Homework Statement I'm trying to plot the trajectory of a photon near a schwarzschild black hole. I have the equation for the trajectory but I'm stumped by the impact parameter and cannot find out how to calculate it. Homework Equations \frac{d\phi}{dr} = \pm \frac{b}{r^{2}\sqrt{1 -...

Hi, I am performing a set of tests using a pendulum. The test involves a pendulum of length 0.55metres, the weight of the entire pendulum is 2kilos. The test involves letting the pendulum go from a set height and calculating the force when it impacts an object held in a vice at the bottom...

Homework Statement Alpha particles of kinetic energy 9.6MeV are incident on a silver foil of thickness 7.0 micro meters. For a certain value of the impact parameter, the alpha particles lose exactly half their incident kinetic energy when they reach their minimum separation from the...

Homework Statement A force platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. Starting from rest, a 61.0 kg athlete jumps down onto the platform from a height of 0.610 m. While she is in...

Homework Statement A projectile is launched from a cliff that is 84m tall with an initial speed of 32m/s at an angle of 25 degrees above the horizontal. The object is in the air for a total of 5.74s. What is its impact velocity and at what angle?Homework Equations Vfy = Voy + ayt Vf^2 = Vfx^2...

1. A red train traveling at 72 km/h and a green train traveling at 144 km/h are headed toward each other along a straight, level track. When they are 950 m apart, each engineer sees the other’s train and applies the brakes. The brakes slow each train at the rate of 1.0 m/s2. Is there a...

Hydrogen has an ionization energy of 13.6eV. If 1eV is defined as the velocity of an electron produced by a potential of one volt. Does this mean that a free electron contained in a hydrogen gas could cause impact ionization if a potential of 13.6 Volts were applied to a metal plate within...

hi guys, i have been hearing a lot of speculation about planet x / Niburu's orbit taking it through the centre of our solar system in 2012 obviously with catastrophic effects to bio life. the documentaries i have seen on this event have not come sources which i would consider concrete...

A golf ball is released from rest from the top of a very tall building. Choose a coordinate system whose origin is at the starting point of the ball, and whose y-axis points vertically upward. The acceleration of gravity is 9.8 m/s 2 . Neglecting air resistance, calculate the ve-...

Homework Statement A person jumps from the roof of a house 3.4 meters high. When he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of 0.70 meters. If the mass of his torso (excluding legs) is 41 kg. A. Find his velocity just before...

I need help finding the forces when an aircraft’s jump cable catches to stop a plane on an aircraft carrier ship. The aircraft is traveling at 110 mph with the front of the plane 3 feet off the deck of the ship. If the assumption is made that the cable stops the aircraft immediately (the cable...

Is there a general approach to calculating the impact outliers have on the accuracy of one's (predictive) model?

I have a scenario which is simply a ball hits the ground from above i know the mass of the ball and the speed in mph of the ball just before it hits the ground. No other variables are known, I need to know the force it hits the ground. What is the best way to calculate it? I had thought F =...

If a apple falls on my head, what is the physical value that makes my head hurt?

What would it be like if a 300 km diameter meteorite hit the early (first 1 Byrs) Archean surface? Hint: a smaller impact on Kilawea surface in Hawaii.

http://www.nasa.gov/topics/solarsystem/features/jup-20090720.html

We went paint balling with 17 friends. At dinner we had an discussion if a stronger weapon would result in stronger hit. The question is? Is their a maximum of energy a paint-ball can give to your body, independent of speed or energy. In other words...Will a bigger gun hurts more than a...

When a golf club strikes a ball, is the ball carried along with the club face for part of the circular arc of motion (after impact)? If so, how does this occur? For instance, I am assuming that the impact takes place at the instant that the club is exactly vertical. I am also assuming that...

Do the electric lines of force necessarily depict the trajectory of a charged particle? Or do they depict the trajectory at all.

Homework Statement A bullet is fired from a cliff 36m above the ground. If the bullet is fired at an angle of 25 above the horizontal, and has a muzzle velocity of 80m/s, what is the velocity of the bullet as it hits the ground? d = 36m vi = 80m/s angle = 25 degrees Homework Equations...

Hey guys, I've got a problem that I have been puzzling over for a long time now. I think that the mass of a beam should not affect the amount that the beam deflects when another mass is dropped on it, however my mechanics lecturer thinks otherwise, i don't understand his logic. If I have a...

Would a bird strike impact with an in-flight jet propulsion intake have a significantly less probability of avoiding critical damage if the jet intake was fully idle or non-active at the point of impact? Would the air-flow pattern of an abruptly idled engine perhaps even help by greatly...

http://hyperphysics.phy-astr.gsu.edu/hbase/flobi.html" Since the gravitational potential energy of the falling object at the point of impact is higher than the gravitational potential energy at the distance traveled after impact, where does the energy go? It is shown that the KE is removed...

About week ago I decided to make an attept to create multiplayer rpg game in j2me. The game needs server so I use c and mingw32 as compiler. I thought the biggest problem will be network programming as I never tried that before. But the j2me client is connecting nicely I have managed to get...

hi my friends I want some informations to study about gamma wave and interactions of it on humans cells.thancks alot.

Homework Statement A rifle with a barrel length of 50.86 cm fires a 7.06 g bullet with a horizontal speed of 449 m/s. The bullet strikes a block of wood and penetrates to a depth of 12.9 cm. What resistive force (assumed to be constant) does the wood exert on the bullet? 5516.6785...

Homework Statement A ball is thrown toward a cliff of height h with a speed of 23.88 m/s and an angle of 52° above horizontal. It lands on the edge of the cliff 3.49 s later. What is thy ball impact speed? 2. The attempt at a solution shouldnt it be Vx= Vo*cos(theta) Where...

A 35.0-g bullet strikes a 4.7-kg stationary piece of lumber and embeds itself in the wood. The piece of lumber and bullet fly off together at 8.0 m/s. What was the original speed of the bullet? I don't know where to begin...