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How does inward force of gravity overcome outward force of radiation pressure during the end of a stars life?
Choose only ONE:
a. As the star gets bigger, the force of gravity also gets bigger, while the radiation pressure stays the same.
b. The star fuses more hydrogen as it gets near the end of its life, then the fusion of hydrogen is converted to gravity.
c. Near the end of its life, a star runs out of hydrogen to fuse, and fusion is what creates the radiation pressure.
d. Gravity increases with time, so the older a star gets, the more it is affected by the force of gravity.
Answer: when there is nothing to burn gravity overcomes the power of nuclear fusion because there is no nuclear fusion
Category: Astronomy & Space
BROWSING BOOKS; Editors Choice: Other recent books of particular interest
HENRY JAMES: The Mature Master, by Sheldon M. Novick. (Random House, $35.) Striving to supplant the common view of James as a passive, fearful man, Novick paints him as a gregarious, sometimes heroic, often troubled citizen of the world. SIGNED, MATA HARI, by Yannick Murphy. (Little, Brown, $23.99.) Whatever Mata Hari did when lights were low,
BRIGHT IDEAS; Innovative Minds Dont Think Alike
ITS a pickle of a paradox: As our knowledge and expertise increase, our creativity and ability to innovate tend to taper off. Why? Because the walls of the proverbial box in which we think are thickening along with our experience. Andrew S. Grove, the co-founder of Intel, put it well in 2005 when he told an interviewer from Fortune, When - Janet Rae-Dupree article disputes so-called curse of knowledge, phrase used in 1989 paper in Journal of Political Economy, that means once person becomes expert in particular subject, it is hard to image not knowing what person does; says there are proven ways to exorcise curse; holds experts in field can benefit from outsiders perspective; drawing (L) - Janet Rae-Dupree writes about science and emerging technology in Silicon Valley. - By JANET RAE-DUPREE
How do I calculate the work against gravity required to build the following structure?
Calculate the work against gravity required to build a tower of height 35 ft in the shape of a right circular cone with base of radius 7 ft out of brick. Assume that brick has density 24 lb/ft^3
Ive tried 20 different answers...
Answer: Hello,
mass of the cone: m=density x volume
m=d*1/3*pi*r^2*h
work against gravity=mg*h
if my answer wrong, can you please give me the correct one,its really an interesting question.
thanks so much!
Category: Physics
Theater
THEATER Approximate running times are in parentheses. Theaters are in Manhattan unless otherwise noted. Full reviews of current shows, additional listings, showtimes and tickets: nytimes.com/theater. Previews and Openings COME BACK, LITTLE SHEBA Previews start on Thursday. Opens on Jan. 24. The Manhattan Theater Club revives William Inges 1950
What is the gravity reading close to the center of the earth?
The gravity increases the further down you go toward the center of the earth.
Answer: gravity DECREASES as you go down.
Category: Astronomy & Space
How much gravity is needed to slow time enough to be measured?
I asked a question like this before, and was told that even the gravity of a black hole can only slow time 1/100 of 1/100 of 1%, but every sci-fi book and movie, that I have seen or read, shows that gravity in a black hole is like 1 second for every 1 year outside the gravity field.
The question is not about a black hole, it is about time and gravity.
Answer: Time can now be measured to one part in 10^17th or better. So the gravity at the surface of the Earth, compared with the gravity in an Earth trailing solar orbit can be measured with clocks. It's not significant, just measurable.
GPS needs to be accurate to about 9 nanoseconds. So various effects, like the speed that the satellites orbit and propagation time through the denser atmosphere, and refraction that takes place all have to be taken into account for it to work. If you're off by a nanosecond, your position is off by a foot. GPS claims to be good to 10 meters, but with multiple readings, can get to about 3 meters.
Category: Physics
LETTERS; The Order of the Universe
To the Editor: Re Laws of Nature, Source Unknown (Dec. 18): Science is a methodology for asking questions. The so-called laws are simply todays answer to the question posed. As with all things transient, tomorrow a different form of the question may modify, discard or replace the law pertaining to whatever is being investigated. The - Tom Clarke, Rod Carlson and Mel Schwartz letters on December 18 article about laws of nature; drawing
Gravity (2013) - IMDb
Directed by Alfonso Cuarón. With Sandra Bullock, George Clooney, Ed Harris, Orto Ignatiussen. A medical engineer and an astronaut work together to survive ...
How Gravity Affects the speed of a ball travelling down a specific gradient.?
I need to know specific laws about how gravity affects the speed of different gradients!! Thanks so much! Best answer gets the points!
Answer: Gravity is constant, but the angle of the slope determines what portion of the gravitational acceleration is directed down the slope. The acceleration down the slope is g times the sine of the angle of the slope.
Category: Physics
'Gravity' review: try not to scream | The Verge
There's a moment in Gravity when you suddenly realize you're not safe. Sandra Bullock's Dr. Ryan Stone is installing a component for the Hubble space telescope, wrapped in her bulky...
What is the difference between specific gravity and density?
Isnt specific gravity the same exact thing except it has no units?
So it the mass is 16g and volume is 2cm3, then the density woud be 8g/cm3. Is the specific gravity just plain 8 with no units?
Answer: Hi Art Master, yes density and specific gravity are different. Specific gravity is also known as relative density. Relative to whom? Relative to water. So relative density or specific gravity of the material is the ratio of the density of the material to that of water. So you are correct.
As 1 g/cm^3 is the density of water, the specific gravity of the substance having density 8 g/cm^3 will be 8/1 = 8
Here units get cancelled. Hence no unit for relative density ie specific gravity.
Category: Physics
Anatomy of a Scene: Video of 'Gravity' - NYTimes.com
Alfonso Cuarón narrates a scene from his science fiction thriller.
What about a 0 gravity aircraft cockpit?
Does aerospace engineers and scientist are developing a 0 gravity environment for aircraft cockpits which will totally render g force effects ineffective on pilots? As technology increases the capabilities of aircraft exceeds than that the limitations of human body could handle, as what i saw in movie "stealth", UAVs are built for that purpose, to do some manuevers which a pilots body is limited to do. Is it impossible to have such technology now? im referring to 0 g force effect cockpits.
Answer: If you could build a 0 gravity cockpit, you could build a 0 gravity ENGINE. What your thinking of would be an acceleration Damper, which is WELL beyond our current tech.
Category: Aircraft
Box office preview: 'Gravity' headed for a stellar debut - Inside Movies
Gravity has been earning out-of-this-world reviews, but will its box office match the buzz? Here's how I think the box office might shake out this weekend: 1. Gravity – $41 million Warner Bros.
Gravity | Christianity Today
I was prepared to be stressed out by Gravity: you've seen the trailers, so you know what I mean. George Clooney and Sandra Bullock are in space, and then disaster strikes, and they get spun away from their craft. Owing to a ...
'Gravity' review: There has never before been a movie like this | Fox ...
1 day ago ... Gravity” is definitely an experience – an event – and whether or not that lasts, as of right now, there's just nothing else like it. And that is a rare ...
'Gravity': Six things to know about the Sandra Bullock space movie ...
13 hours ago ... If you're a film fan, by now you've either seen "Gravity," made plans to see " Gravity" or gotten annoyed at your significant other for choosing ...
How does gravity work on a molecular level?
It is my understanding is that gravity is present in our known universe, but how does gravity work? It seems to be this invisible force that varies in magnitude depending on where you are. Is there some form to trace gravity, or find out how it actually pushes on objects. Does gravity itself push on atoms, or only the object?
Answer: First of all, gravity never pushes, it only pulls...
The force of gravity can be calculated from Newton's law of universal gravitation between two masses m1 and m2, separated by a distance r:
F = G m1 m2 / r^2.
Gravity (where m1 is the mass of the Earth for example) pulls on all particles with mass (that's the "universal" in Newton's equation) , so it pulls on protons, neutron electrons etc. The fact that there are other much stronger forces (electromagnetic force keeping electrons around nuclei, strong nuclear forces keeping nuclei together, intramolecular forces knitting molecules together) keeps atoms atoms and molecules molecules and solids solids. The effect is that the object itself is rigid and that the total pull on an object is the sum of all the small pulls on the particles that constitute the object.
What happens if the forces between the particles are not stronger than gravity? Spill some water on the floor and see the particles all trying to find the lowest point ( a spreading puddle).
Another example is a too steep sand pile, where grains on the outside are pulled down and the forces between the sand grains are not strong enough to keep the outside grains where they are.
According to general relativity theory, the origin of gravity is the bending of the space-time around a mass. Another mass will move through this curved spacetime in the straightest possible path (like a great circle on the globe is the shortest path between two points and in that sense as straight as the geometry allows for). That shortest path is bent and we experience that as a force.
Why spacetime is bend around a mass though, that's an unanswered question sofar, so if you want a Nobel Price in Physics, here's your challenge...
Category: Physics
MOVIE REVIEW | THE BUCKET LIST ; For Geezers Gone Wild, Too Little, Too Late
The Bucket List operates on the hope that two beloved stars rubbing their signature screen personas together can spark warm, fuzzy box office magic. I wouldnt count on it. Stars or no, it is an open question whether audiences will flock to a preposterous, putatively heartwarming buddy comedy about two men diagnosed with terminal cancer living - Stephen Holden reviews film The Bucket List, directed by Rob Reiner; Jack Nicholson and Morgan Freeman star; photo (M) - By STEPHEN HOLDEN
ARCHITECTURE; Even If His Own Work Isnt Broken, a Brazilian Architect Fixes It
What to do with our aging architectural heroes? What if their genius deteriorates and they begin tinkering with their own masterpieces? A powerful case in point is the Brazilian architect Oscar Niemeyer, who celebrated his 100th birthday this month. In the 1940s, 50s and 60s he established himself as one of Modernisms greatest luminaries, - By NICOLAI OUROUSSOFF
Theater Listings
THEATER Approximate running times are in parentheses. Theaters are in Manhattan unless otherwise noted. Full reviews of current shows, additional listings, showtimes and tickets: nytimes.com/theater. Previews and Openings COME BACK, LITTLE SHEBA Previews start on Thursday. Opens on Jan. 24. The Manhattan Theater Club revives William Inges 1950 - By THE NEW YORK TIMES
HUNTSVILLE JOURNAL; When the Germans, and Their Rockets, Came to Town
In 1950, this cotton market town in northern Alabama lost a bid for a military aviation project that would have revived its mothballed arsenal. The consolation prize was dubious: 118 German rocket scientists who had surrendered to the Americans during World War II, led by a man -- a crackpot, evidently -- who claimed humans could visit the moon. - Local boosters in Huntsville, Ala, are hoping to use 50th anniversary of Explorer I, first American satellite launched into orbit, to promote Huntsville as Rocket City; relocation of German rocket scientists to area in 1950 transformed city from small cotton town to birthplace of space program, now with one of countrys highest concentrations of rocket scientists and propulsion experts; photos; map (M) - By SHAILA DEWAN
How would you work out the deceleration of the gravity as M1 grows distance between itself and M2?
Gravity stands at 9.8m/s2 on the surface of Earth, it becomes 0m/s2 at 500 from the surface of Earth so I need to know what would be an appropriate formula for me to work out the gravitational field of an object.Thank you
Answer: The Earth's gravity does not become zero, at any distance. Even a billion light years away, the Earth's gravity is very small, but not zero.
The formula for the Earth is acceleration of gravity = K / distance^2
At distance = 6357 km (the surface), gravity is 9.813 m/s^2. So K = 9.813 * 6357^2
Just use distance in km, and the formula gives you the gravity in m/s^2.
The general formula is g0 = G m / r^2
G = 6.67438 x 10^-11 m^3 kg^-1 s^-2
m = mass of central object
r = distance to center of central object
Category: Astronomy & Space
Video Reviews of 'Gravity,' 'A Touch of Sin' and 'A.C.O.D.' - NYTimes ...
Times critics on “Gravity,” “A Touch of Sin” and “A.C.O.D.”
Gravity - Official Main Trailer [2K HD] - YouTube
Sep 4, 2013 ... http://www.gravitymovie.com https://www.facebook.com/gravitymovie In theaters October 4th. Academy Award® winners Sandra Bullock ("The ...
BOOKS OF THE TIMES; Sci-Fi Dream Turns Worlds Worst Nightmare
DOOMSDAY MEN The Real Dr. Strangelove and the Dream of the Superweapon By P. D. Smith Illustrated. 553 pages. St. Martins Press. $29.95. In Destination Unknown, an Agatha Christie thriller published in 1954, two women sit knitting in an English hotel, discussing the latest terror weapon of the nuclear age, the cobalt bomb. I do think all - William Grimes reviewsÿ - By WILLIAM GRIMES
How much gravity is required to manipulate light?
Okay, gravity can manipulate light, to make objects seem as if they were moving. How much gravity is required to move around light and how can this be reproduced? Or what other ways can light be manipulated?
Answer: Well, by how much deflection is required for light to "move around"?
It occurs here due to Earth's gravity, but we don't really have the technology to measure that accurately.
We have measured otherwise blocked ecliptic stars to have their light gravitationally lenses around the sun with a measured deflection of a little more than one arc-second.
Other non-gravitational methods of manipulating light:
Reflection
Refraction
Diffraction
Category: Physics
How do you find out what the specific gravity of a beer is supposed to be when it is finished fermenting?
The starting specific gravity before pitching yeast was 1040 it has been 6 days and all signs of fermenting are gone. I am wondering what the specific gravity should read when completed. I am using an ironmaster irish stout extract kit,with an ounce of northern brewer pellet hops, and a can of dark malt to replace sugar. Please help! Am I ready to bottle? The hydrometer now reads 1020.
Answer: 1.020 is a fairly high finishing gravity, and indicates a sweeter beer. You are ready to bottle once for 3 days, the gravity doesn't change (much).
Also, your alcohol can be calculated thus:
40-20 = 20
20 * 0.125 = 2.5%ABV.
This makes me think that either your initial hydrometer reading was off, the yeast is not done fermenting (though it will not ferment more if it stays the same a few days, leading to what we call a "stuck fermentation" ... google for remedies), or this is just a light sweeter beer.
Category: Beer, Wine & Spirits
How do Atheist know that gravity is holding everything in the universe together and not GOD?
There is no proof of gravity except that we all dont go floating up in the air and how the earth and planets rotate around stars.
How do u know that God isnt holding everything together and steadily expanding the universe?
Answer: "How do Atheist know that gravity is holding everything in the universe together and not GOD?"
Cos everyone with half a brain knows that imaginary space dudes don't exist.
1. There is NO evidence which points to an imaginary psychopath in space suffering cerebral palsy, uncontrollably waving his arms about, creatin' stuff outa nothin' for no discernable reason.
2. Just by the SIMPLE act of looking around anyone can see that shït happens to all and sundry regardless of ANY thought, deed or circumstance, exactly as if there was NO invisible space chappie pulling any strings at all.
The world works exactly as you'd expect if there were no god.
~
Category: Religion & Spirituality
How can Newton discover gravity while Galileo discovered the gravity principles 50 years before him?
Is it wrong that Newton discovered gravity? How can he discover it when its principle were discovered by Galileo? Does that mean that Galileo is that one who first discovered gravity as a type of force? Or there is another scientist who did, other than these two?
Please explain your answer. Thanks in advance.
Answer: Gallaleo discovered that gravity pulled on heavy and light objects equally.
That is, heavy objects do not fall faster than lighter objects.
Newton realized that while the earth attracts a falling bowling ball, that same bowling ball also attracts the earth.
That's a very different idea.
They both deserve the credit that the science community awards them.
Category: Physics
HowStuffWorks "How does gravity work?"
Gravity is the force that causes two particles to pull towards each other. Learn about gravity and find out how Newton and Einstein explain gravity.
Gravity - Rotten Tomatoes
Review: Alfonso Cuarón's Gravity is an eerie, tense sci-fi thriller that's masterfully directed and visually stunning.
How does the inward force of gravity overcome the outward force of radiation pressure during the end of a star?
A) As the star gets bigger, the force of gravity also gets bigger, while the radiation pressure stays the same.
B) The star fuses more hydrogen as it gets near the end of its life, then the fusion of hydrogen is converted to gravity.
C) Near the end of its life, a star runs out of hydrogen to fuse, and fusion is what creates the radiation pressure.
D) Gravity increases with time, so the older a star gets, the more it is affected by the force of gravity.
Answer: C ...
At the end of the Giant/Super Giant phase, it starts to run out of hydrogen all together. When it runs out of Hydrogen, or is nearly out, it begins converting Helium to Carbon and Carbon to heavier elements until it gets to a too stable element for its amount of heat and pressure to convert, then when the radiation output starts waning, the Gravity of the star will begin to overcome the outward pressure of the radiation.
(supposedly in very very hot stars(blue), they can have the ability to get to Iron, in which case is very stable and is near the end of the star's life)
Category: Earth Sciences & Geology
'Gravity' Review by Astronaut Buzz Aldrin - The Hollywood Reporter
This story first appeared in the Oct. 11 issue of The Hollywood Reporter magazine.
Box office update: 'Gravity' blasts off with $17.5 million Friday | Inside ...
Warner Bros.' $80 million thriller Gravity demonstrated some major pull on its opening day at the box office. The film, which stars Sandra Bullock and George Clooney as stranded astronauts, scored a tremendous $17.
GRAVITY - In theaters October 4, 2013
From acclaimed filmmaker Alfonso Cuaron comes “Gravity”, starring Sandra Bullock and George Clooney. View the trailer and explore the exclusive 3D ...
BOOKS OF STYLE; Heres Looking at You, Inside and Out
HOW NOT TO LOOK OLD Fast and Effortless Ways to Look 10 Years Younger, 10 Pounds Lighter, 10 Times Better. By Charla Krupp. 256 pp. Springboard Press. $25.99. SIMPLY IRRESISTIBLE Unleash Your Inner Siren and Mesmerize Any Man, With Help from the Most Famous -- and Infamous -- Women in History. By Ellen T. White. 264 pp. Running Press Book - Liesl Schillinger reviews books How Not to Look Old: Fast and Effortless Ways to Look 10 Years Younger, 10 Pounds Lighter, 10 Times Better by Charla Krupp and Simply Irresistible: Unleash Your Inner Siren and Mesmerize Any Man, With Help from the Most Famous--and Infamous--Women in History by Ellen T White; photos (M) - By LIESL SCHILLINGER
Gravity (film) - Wikipedia, the free encyclopedia
Gravity is a 2013 3D space drama film co-written, co-produced, co-edited and directed by Alfonso Cuarón. The film stars Sandra Bullock and George Clooney as ...
How can gravity escape the gravitational pull of a blackhole?
If gravity is a wave, like light, and it spreads across the galaxy, how can it escape a blackhole? It would have to exceed the infinite escape velocity of a blackhole and travel faster than light, right?
LIGO, Kip Thorne believes gravity is a wave. (To my understanding)
Answer: You misunderstand what Kip is saying and LIGO is looking for.
The force of gravity is not a wave, any more than the force of electrical attraction and repulsion is. Shake an electrical charge around, and it will produce light waves, but the force of attraction between charges is not a wave. GR says that if you shake a mass around hard enough, it will emit gravitational waves. But that's completely different from the static gravitational field around a black hole.
Category: Astronomy & Space
How does zero gravity affect your blood pressure and pulse?
The heart has to work fairly hard to pump blood against gravity to get it up to your head. Was just curious if anybody knows what happens in outerspace.?If there is no gravity does your heart work harder or less . Are astronauts bp,s and pulse significantly lower while in space?
Answer: Hi. Just a guess, an astronaut will not have gravity to effect BP since it does not have to pump against the forces normally associated with pushing blood from the legs back up to the heart (or head). I think they would be lower. My opinion.
Edit. Follow up. http://www.space.com/scienceastronomy/generalscience/gravity_adapt_010831-1.html
Category: Astronomy & Space
Gravity Review: All Blockbusters Should Be This Intimate and Beautiful
As you would have guessed from the trailers, with Gravity director Alfonso Cuarón has made a horrifying movie about being stranded in space. But the best--and most surprising--thing about Gravity is that it's also tasteful and ...