An impact event is a collision between astronomical objects causing measurable effects. Impact events have physical consequences and have been found to regularly occur in planetary systems, though the most frequent involve asteroids, comets or meteoroids and have minimal effect. When large objects impact terrestrial planets such as the Earth, there can be significant physical and biospheric consequences, though atmospheres mitigate many surface impacts through atmospheric entry. Impact craters and structures are dominant landforms on many of the Solar System's solid objects and present the strongest empirical evidence for their frequency and scale.
Impact events appear to have played a significant role in the evolution of the Solar System since its formation. Major impact events have significantly shaped Earth's history, and have been implicated in the formation of the Earth–Moon system, the evolutionary history of life, the origin of water on Earth and several mass extinctions. The prehistoric Chicxulub impact, 66 million years ago, is believed to be the cause of the Cretaceous–Paleogene extinction event.Throughout recorded history, hundreds of Earth impacts (and exploding bolides) have been reported, with some occurrences causing deaths, injuries, property damage, or other significant localised consequences. One of the best-known recorded events in modern times was the Tunguska event, which occurred in Siberia, Russia, in 1908. The 2013 Chelyabinsk meteor event is the only known such incident in modern times to result in numerous injuries. Its meteor is the largest recorded object to have encountered the Earth since the Tunguska event.
The Comet Shoemaker–Levy 9 impact provided the first direct observation of an extraterrestrial collision of Solar System objects, when the comet broke apart and collided with Jupiter in July 1994. An extrasolar impact was observed in 2013, when a massive terrestrial planet impact was detected around the star ID8 in the star cluster NGC 2547 by NASA's Spitzer space telescope and confirmed by ground observations. Impact events have been a plot and background element in science fiction.
In April 2018, the B612 Foundation reported "It’s 100 percent certain we’ll be hit [by a devastating asteroid], but we’re not 100 percent certain when." Also in 2018, physicist Stephen Hawking, in his final book Brief Answers to the Big Questions, considered an asteroid collision to be the biggest threat to the planet. In June 2018, the US National Science and Technology Council warned that America is unprepared for an asteroid impact event, and has developed and released the "National Near-Earth Object Preparedness Strategy Action Plan" to better prepare. According to expert testimony in the United States Congress in 2013, NASA would require at least five years of preparation before a mission to intercept an asteroid could be launched.
Ok, we were doing a lab yesterday in physics class, and we had to find the velocity of a bullet hitting a block with a hole in it's center, and is hung... when the bullet hit the block, it made a 18 degree angle... my teacher gave us a formula for finding the velocity of the block and we got the...
a wooden peg is hit vertically by a mallet which is also moving vertically. The mass of the peck is 0.4kg and the mallet is 2kg. The speed at which the peg starts to move into the ground is 6.67m/s. Given that the ground opposes the motion of the peck with a force of 1kN, find how far the peg is...
So is it going to happen? what will be the consequences if it does
happen, will we suffer a multi pole magnetic field for hundreds of years?
some say that cancer will increase at the multi poles and that thousands
of people will die as a result, so who cares about global warming if
a new...
I want to take a look at the history of philosophy. I would say it's a look at the history of "philosophy of mind", but it covers more than that.
I want to look at the points throughout history where a shift was made, to the using of terms and concepts that had never been used before. I want...
If someday we discover how to mine metals from the core, will it have any effect on the magnetic field or the climate of the Earth due to reduction of heat in the core as the metal mined will be hot and will slowly drain the heat of the core.
Launched today at 1:47 pm.
Impactor will hit comet Tempel 1 on July 4.
Love the real-time blog for the launch...
http://www.space.com/missionlaunches/delta2_launch_050112.html
Deep Impact Mission Sounds Scary?
I don't like this misson. There are better ways to study this thing. Land on it and do the probing! Just what we need to do. Blow this thing to bits so it can rain down on us,possibly.It ain't worth the chance.
"The impact spacecraft will fly head-on into...
The Impact Point Song
***
If Archimedes look around
To find Newton underground
He would use his "c" class lever
To teach Newton the manners of clever
***
Newton, Newton, you naughty one
What the hell you think you've done?
You distorted the balance you woke our GOD
Your punishment is...
I need some help from the experts, because I am really having trouble simulating this in the real world which is where I can understand things.
If propane gas was released from a container (typical metal propane tank or cylinder) where it had been stored as a liquid under pressure, it would...
Hi, sorry if this is posted someplace else - I couldn't find a search function.
I want to know the force of impact of a Porsche 911 impacting a standing pedestrian at 95 mph.
I understand that F=m*a
But what I don't get is this: acceleration is measured here in mph. But the impact...
In the Astronomy Events thread, Check is citing odds that are even worse now!
http://space.com/scienceastronomy/asteroid_risk_041224.html
Those odds are getting a little close for my taste.
Hey, anyone seen this incredible photo??
Impact pic
Much larger pic
APOD article
http://www.news.com.au/common/story_page/0,4057,11480527%255E13569,00.html
It appears to be the first ever recorded image of a meteor impacting the Earth (though for some reason, they're saying...
In a closed system a hydrocarbon is burnt. The products which are produced have a temperature of X degree celcius. What will happen once the temperature of whole of the system becomes X degree celcius? How will it affect the burning of hydrocarbon?
Thanks a lot for any help.
Abd. S.
A 4.2 g lead bullet moving at 260 m/s strikes a steel plate and stops. If all its kinetic energy is converted to thermal energy and none leaves the bullet, what is its temperature change?
---
I don't even know what formula to use or how to start.
I could get force, by multiplying the mass...
Hi
Arcsin width/length of a water droplet on any surface will give you the angle between the droplet trajectory before falling (assume straight line rather than parabola) and the surface upon which it fell.
As this angle approaches 90degrees (water drop falling vertically on a horizontal...
Hi there.
I was wondering if the universe is curved or if it is flat.
By the way, one other question.
When a person lifts an object the object gains Ep. Is the energy given to object by the person or does it gain energy by the Gravitational Field? even though i know that Forces...
Just a question I am a little stuck on. I missed last week's chem lecture:
What effect would each of these changes have on global warming?
a) volcanic eruptions
b) CFCs in the troposphere
c) CFCs in the stratosphere
Here's what I think so far..
a) Volcanic eruption release large...
A meteor has a speed of 83.0 m/s when 811 km above the Earth. It is falling vertically (ignore air resistance) and strikes a bed of sand in which it is brought to rest in 3.31 m. What is its speed just before striking the sand?
So here is the formula that I have but it doesn't give me the...
Hi, I need help solving this problem. On one hand, I think that there's not enough information to solve it, on the other hand, I think there has to be a way to cancel out all the information that's not provided, and do the problem with only what's given. But I can't come up with a way to solve...
A golf ball (m = 38.6 g) is struck a blow that
makes an angle of 46.3 degrees with the horizontal.
The drive lands 273 m away on a flat fairway.
The acceleration of gravity is 9.8 m/s^2 .
If the golf club and ball are in contact for
10.2 ms, what is the average force of impact?
Neglect air...
How much does one have to smoke to have a noticable impact on their health?
How often does one have to heavily drink to have a noticable impact on their health?
Always have been questions i never got around to asking.
I need help on how to approach this problem and which equations I can use.
It was a problem that we were supposed to think about, but even that's difficult. Here it is:
If there is a 70 lb. girl roller blading at a constant speed of 5 mph and she suddenly hits a rock and trips downward, what...
A typical car with a dummy crashed into a wall, what is a suitable parameter for the head of the crash test dummy(with and without restraints) as a function of time? and how do i estimate the forces acting on the head in the two situations? Thanks a lot :confused:
I am trying to understand how Space and time Relate with Gravity. In Physics class i saw a video showing planets Rolling around on a grid with the sun Making the deepest indentation and planets making smaller ones. Now I can but help thinking that this didnt give me the full picture .. Is it on...
Is it true I have more chance of expiring from a global cotastrophe in the next 50 years as a result of a terestrial object from outer space colliding with Earth than winning the powerball with a $1 ticket.
a 0.3 kg ball moves toward a bat with a velocity of 50 m/s [E]. It is struck and the bat remains in contact with the ball for 0.02 seconds. The ball leaves the bat with a velocity of 100 m/s [W]. Calculate the average force exerted on the bat. (answer: 2300 N)
...i am just horrible at these...
This may be more of an engineering question, but here goes:
I am designing an archery target and am trying to establish the impact force of the arrow on the target.
The arrow is traveling at 100.6m/s and weighs 22.68g, what would be the force of the arrow on the target?
How does this...
I’m just wondering if anyone’s heard about this?
http://www.rense.com/general53/rumor.htm
http://www.freerepublic.com/focus/f-news/1128284/posts
& http://www.bushcountry.org/news/jun_news_pages/g_060104_withheld_june_2004.htm
And you can google for “Snowball intercept” and get lots of...
Hello there,
I got this little project I am working on, it maybe simple to you , but I have a hard time getting some useful results.
I have an assembly, it looks like a square box(section) 6 inches long, with a cylinder attached to one end.
On the end I have the possibility to attach a...
Hi- I have a quiz tomorrow on Newton's 1st and 2nd Laws. I'm kind of iffy with the second law, especially when it comes to impulse and impact. What is impact, and how can you measure impulse? For example, what if an object is dropped onto a soft couch, etc, etc.. basic theories... i haven't yet...
Hi can anybody verify if I am using the correct formula,
Here is the problem first,
A bullet embeds itself in a pendulum bob, and the bullet+bob together swing up to some maximum height, which is easy to measure. IF the bullet has a mass of 15g, the bob's mass is 4kg, and the combination...
I am trying to find the kinematics of a car collision with a wall. To calculate the damages, should I take into account the momentum or work done?
In other words, is this proportional to velocity or square of the velocity?
Thanks,
Venkatesh
A frequent topic of debate for golfers is the initial direction that the golf ball follows when it is struck with the club face angled right or left relative to the direction of the moving clubhead (i.e., an "open" or "closed" face for those familiar with golf terminology).
The common belief...
I'm really fired up about physics now. But I can't puzzle out the following:
Q. When you float in fresh water, the buoyant force that acts on you is equal to your weight. When you float higher in the high-density water of Salt Lake, the B.F. that acts on you is actually:
1) greater than your...
I would have to say the "Roe vs Wade" case. It has contributed to mass genocide (fetuscide?) of tens of millions of "could have been Americans". In this group would have been countless Teachers, Doctors, Scientists, Engineers, etc. Maybe one of them would have found a cure for cancer, who...
if there's two identical object of the same mass and same composition but is of two different colours, would one weigh heavier than the other?? assuming that the coating of paint that gives the object its colour is of the same density for each colour and that same volume of each colour is used...
What if all particles were not moving but standing still. What would it be like then? If it was so on the quantum level would that affect the way we experience the world?
For something to travel at any speed it has to exist.
Light does not exist as a physical entity. It is the stimulation of Primary Force.
Light does not travel.
Think of it this way. Suppose you had a steel bar of x feet. Hit the end with a hammer. Then ask how long does it take for...
Physics Project :D
okays, for physics I've got to devise a contraption which will protect a raw egg from ing while dropping 3 stories.
the devices must fit through a 1sqr foot rectangle, it does not have any maximum height, it cannot use packaging material or food/peanut butter/jello/gell...
these questions are challange questions from our teacher (MIT grad) who gave us these knowing that they were a bit out of reach for us as we are a beginning intro physics class(HS). we haven't but scratched the surface on these topics. so we're trying to find/acquire at least a basic, rough...
Hello all,
I was wondering what advance in physics had the most impact in history and why.
Personally, it's tempting to say E=MC^2, which said it was possible to give us the bomb, but it seems that that is too recent to really calculate the effects.
Perhaps Newton's laws of motion? Or...
Where to find those? I thought it was on the ISI Journal Citation Report website, but I have been going around in circles without finding anything..
How about citation finder?
Hi good people,
I have some problem with determining impact force acting on rubber-like elastic material (conveyor belt).
The problem is:
The object of mass M is released from the height H on conveyor belt which is clamped at the both ends and subjected to an uniaxial tensile force T. I...
I was thinking.when we mass produce electricity,we send out high amounts of negative magnetic fields.whats the possibility that when offsetting the planets natural balance of negative electromagnetism.the planets positive side would be over powered by the increase of negativity.do you think this...