What is the True Value of Gravity

I love these gravity questions! Don't get offended because people will likely have a field day with this question.

Gravity is caused by mass and the distance from it. That is to say that gravity at sea level is not the same as gravity on top of a mountain. The center of the earth is your reference for determining your distance. At the base of a mountain, a plumb bob will be pulled toward the mountain.

Motion through space (or the air) causes a distortion to time as you know it. Therefore, time is somewhat of an illusion and it really depends on gravity as well.

I apologize for not going further, but I suppose that my now you are thinking this is impossible. Wow, are you in for some mind blowing learning!

I may seem offended but, I am not actually. Some may consider this dumb questions, but it's pretty interesting. We all starts at the basics, like this site can be seen even if you don't have any account in here, let's just say, we pretend dumb and blunt even if we are or we are not, for the sake of good discussion and might as well some thing to learn and explore about the subject matter, I mean why not-be a dumb sometimes or often times? who cares.

I do not trust myself all the times, our eyes and brain are sometimes deceptive, reading through other peoples perspective is amazing. I admire most of the people around here, sound engineers they are. Some, though I did not hate, but i learned to love hmmm.. well, carry on then. O' and I invited some of my students down here, to ask question not assignments, though possibly there will be some asking answers. I said CR4 is a site of learning, top forum indeed.

Oppss!! Correction on the above "axis" rather than "access" I apologize

No question is dumb but answers are unfortunately very often !

To give you an example how it can be important for industrial users.

To calibrate torque transducers weights at known lever arms are used.

In order to reach the required uncertainty (for higher classes it has to be very very small) the gravity value at the place where the rig is placed is measured.

hmm "at the base of the mountain, a plumb bob will be pulled towards the mountain" wow, really?

Indeed. This was very apparent during the British survey of India in the 19th century. The mass of the Himalayan mountains created a significant error in the surveyed base line. Actually, the surveyors were making corrections for the mountains, but the errors were due to the fact that the Himalayas were less dense than was assumed. This in turn lead to the geologic concept of isostacy developed by Pratt and Airy.

Interesting..

...and depending on which way the wind is blowing, the day can be longer or shorter by up to eleven milliseconds.

You really need to read the Wikipedia article on this topic, Murphy.

I've written some pretty harsh replies to your posts, and I'm sorry. You always bounce back cheerfully; sometimes amazingly so. That does more to lift my spirits than most anything I've seen on this forum in the eight years I've been here.

You're a rare breed these days, indeed. Restores a bit of my faith in Humanity.

Thanks

No problem europium mkII.

Not only that, but very sophisticated measurements of local acceleration (not standard gravity of 9.80665 m/s²) can reveal much about the local density of earth. This has application (sometimes) in exploration for minerals including oil (large pools can lower the local acceleration).

Gravity of Earth - Wikipedia, the free encyclopedia

‎Variation in gravity and ... - ‎Estimating g from the law of ...

• Standard gravity - Wikipedia, the free encyclopedia
  
• Gravitational constant - Wikipedia, the free encyclopedia

Yes, but if the Earth stops rotating and the sun is steady all day and night, would it not increase to some point?

Go to the beach and think about tides.

there's a lot of distraction on the beach.

Well, gravity might be connected in anyway around.

If you can go to the beach, and still be thinking about tides (unless it is winter time beach gazing), you are a better man than I.

Or the beach is so deserted that the pretty ladies are too far apart to observe them without jogging from one to the next, using binoculars, spending too long observing the only one close enough, or lowering your standards of 'pretty' or 'lady'. (All these methods will get you labeled a creep, for different reasons. Some may even get you put on one of those lists where you have to inform the neighbors when you move into the area.) You'll find 'deserted beach days" even in the summer.

Just because one reads the menu, does not mean he should eat the menu, or anything on it. I have tried to explain this to my wife several times, and all I get is the "laser eye".

Yes, there is a huge difference between merely "pretty", and "pretty lady". I have made friends with a number of pretty ladies that have nothing to do with bikinis, or other skimpy clothing. Sometimes beauty is simply beheld in the mind - the talents and/or creativity of someone that makes them a suitable attractive candidate for friendship.

Dear Mr. Noudge79,

If the EARTH stops rotating, the centrifugal force developed at the Earth's Surface will become ZERO and therefore the Gravitational Force will be more.

On the Sun shine side the Temperature will steadily rise and become un-bearable and on the dark side the temperature will fall down to un-bearable limits.

DHAYANANDHAN.S

That's right, and without reading every post I think yours is the first that answers the OP's question! I calculate centrifugal acceleration at the equator = 0.034 m/s^2 (note to OP - not m/s). So increase in observed g is ~ 0.3%. Also g is not constant all over Earth, it's slightly higher at the poles as radius is smaller there than at the equator.

I would not define that as the value of gravity, but rather the acceleration due to gravity due to the mass of the earth. If you take two small spheres and hang them near each other then there is a gravitational force that attracts each other, miniscule, but it is there.

Nevermind

That's why its takes less energy to launch a rocket into space from the equator, then it does when its closer to the poles

When you launch a satellite, you have to do two things. You have to lift it above the atmosphere (70-100 miles) and you have to accelerate it to 18000 mph. If you launch from the equator to the west, you have a 1000 mph head start due to the earth's rotation.

East.

We launch to the East....I've watched enough of them, always East.....but that's from Cape Canaveral....

http://www.space.com/27544-antares-rocket-launch-east-coast-visibility-maps.html

Yes, East.

Centrifugal force is directly proportional to the radius, right? Is this the main reason why there's localized gravity the farther away your are on the center the greater the centrifugal force to result a lesser gravity at elevated heights or is it caused by the localized density of the earth?

Centripetal acceleration (what you are calling 'centrifugal force') is zero at the poles and maximum at the equator. Not only does the magnitude vary with latitude but its direction varies also.

If you were at a point 45 degrees north or south latitude, the direction of the acceleration vector would point -45 degrees north or south respectively (that is, into the ground). Close to the poles it points at the horizon (across the top of the pole) but with a magnitude of nearly zero, whilst at the equator it is a maximum pointing straight down. The centripetal acceleration vector is always on a line between you and a point on the Earth's spin axis and perpendicular to it.

If Earth suddenly lost its gravity you would fly due eastward at a velocity related to the cosine of your latitude, but from your point of view you would appear to be receding backwards relative to the Earth's surface as it continued to rotate eastward beneath you, ie, you would appear to be moving westward as you gained altitude.

I think that's just about the answer OP expected, but I'll raise the deal just for the heck of it. Current earth ellipsoid geometrical shape is not determined by its solid crust, it's too shallow to actually resist conversion to something closer to a perfect sphere, if it somehow stopped spinning. That would give us another diameter to calculate gravity difference from, no? S.M.

There are already dozens of methods for calculating Earth's 'radius' (ellipsoids don't have radii, further complicating the meaning of 'radius'). If Earth stopped spinning it would change shape making an even bigger mess of things than it already is.

There is a gravitational attraction between all objects that have mass. The mass of the Earth is so large that it dwarfs all other net attraction but those forces are still there. The local mass density will have an additional effect of varying the force of gravity. These variations measured using gravimetry will happen at several significant figures smaller than the nominal acceleration value of 9.81 m/s you cite.

Interesting, how did they find that on rosetta?

"As the spacecraft passes close to comet 67P/C-G, it is pulled slightly off course by the comet's gravity, resulting in tiny changes to the spacecraft's velocity. These small deviations are recorded in the spacecraft's radio signals as they are beamed back to Earth, and can subsequently be translated into measurements of the mass and density structure of the comet. The measurements can also be used to refine the details of the comet's orbit along its trajectory around the Sun.

For the Rosetta mission, this task comes under the umbrella of the Radio Science Investigation (RSI). Using 80 hours worth of tracking data between 6 August, since arriving at the comet, and up to 9 August, the RSI team made a first estimate of the comet's mass as approximately 1x10^13 kg +/-10%, or about 10 trillion kilograms."

http://blogs.esa.int/rosetta/2014/08/21/determining-the-mass-of-comet-67pc-g/

According to their current catalog, KrisDel Corporation sells gravity for 9.81 million Euros per metric tonne.

At LynDoor Industries, we believe this price is beyond the average person (to whom gravity is quite useful), and we have a sell price of $4,900 USD per pound. This is a saving of 10% over our only competitor in the global supply and sale of gravity.

Don't forget: LynDoor gravity is also portable: that is to say, it works everywhere! Take it to the bottom of the Marianas Trench, take some on your trip to Mars, it will work as advertised.

Heavy stuff, from the good folks at LynDoor Galactic Heavy Industries.

I hear their mining gravity off of obese people.

I have some excess gravity that has been weighing me down for the past few years. Is there really a market for it? Maybe I can sell it on E-Bay.

Yes we seem to be experiencing a gravity glut here in the US, I expect prices to decline and would hold off on any purchases for now.....Check with SolarTracking® service for all market trends on little known commodities....

Disclosure.....We are short gravity

Funny to think, that if gravity is mass dependent then at atomic level, neutrons and protons are the one to blame for this effect. Using repulsion of like charges and attraction of unlike charges, to have an anti-gravity would be interaction of protons itself, if it follows. Stripping off the electrons of both materials might be impossibility.

I think current thinking is that the Higgs Boson is responsible for mass.....Now you might think that it must then also be responsible for the level of gravitational pull exerted on any object with mass, but you are not looking at the whole picture....Gravity actually pulls on things according to their energy, momentum and mass.....

http://profmattstrassler.com/2012/10/15/why-the-higgs-and-gravity-are-unrelated/

I actually isolated the Higgs Boson before the folks at the LHC. It can be found in chocolate as well as other foods high in fat and carbohydrates and causes an increase in mass as measured with the bathroom scale.

That's only because you lack proper momentum.....

Wow, it's still untapped.

Finding out the equation responsible for what cause gravity, is pretty sure a Nobel price.

What, you are pushing gravity? Don't you realize it is a real drag on our youth?

What is the exchange rate for Martian Gravity vs Earth gravity?

The universal exchange basis is mass units.

Perhaps I need to set up an interplanetary exchange bank.

Need to lose weight without dieting? Take a vacation to Mars.

Or for a more extreme weigh loss, travel to the moon.

However, be warned that an extended stay on the lunar surface will make return to

Earth fatal for most people due to muscle and bone weakening.

Now selling tickets at gate 42.

The price is 1 Kg of UnunPentium for a lunar trip,and 5Kg for the Mars cruise.

How much is that in bars of gold-pressed latinum?

How much is that in Russion ruples today?

You've also got to take into consideration the fact that the diameter of the earth is greater at the equator than at the poles.

Despite being 2½ km less high (measured from sea level) than Everest, Chimborazo's peak is the furthest distance from the centre of the earth because it is close to the equator.

Lately Noudge, you have been posting a lot of "stupid" sounding questions. However, in trying to answer these questions, you have got me thinking about how much I really know about the subject you are asking about; and this, in turn, has motivated me to do some research into these subjects, and review what I think I know. This eventually leads me to learning something that I didn't know before.

If this has been your intent, then thank you.

Same here Greg.

Pretty much the same, if you fall from the Empire State, you'll surely hit the street; that means that you are spinning along with the earth, thus your angular velocity is about zero in relation to the earth.

Yep, thats right, as if the earth was standing still (and you got so freaked by that, that decided to jump...)

Stay thirsty my friend. I don't always bite on these hypothetical questions, but I would say it would take all the unobtainium in the universe to get me to jump without a parachute. Certainly not as an experiment.

The reasoning behind your statement "as if the earth was standing still", is simply a lack of deceleration along the tangent of rotation, relative to acceleration toward the street.

If one could start a fall from the ionosphere, with zero velocity (relative to what fixed point, I don't know), then there should be acceleration toward earth's center of mass, drag (once you actually fall into thicker atmosphere), and some acceleration westward (from the earth you would be observed to be falling eastward as earth rotated underneath you). The acceleration westward could only arise from side drag (since the air mass is more or less moving with earth), but would not amount to much compared to gravity.

The true value is G: 6.67384 × 10^-11 m³ kg^-1 s^-2

Newton - gravity has no relation to earth's rotation

What would happen if earth stops spinning

Science and Gravity

How to calculate g

Calculation of g

Have fun

Link How to calculate g is back to front IMHO. Of the 3 quantities - g, G and mass of Earth, g is by far the easiest to measure. With a much more difficult experiment G can be determined, and g plus G can then be used to calculate Earth mass.

Time or gravity (probably gravity/time) seems to effect body parts....I recently had to switch from boxers to briefs to avoid trauma from the simple action of sitting.

http://m.youtube.com/watch?v=MTY1Kje0yLg I found this. Thanks everyone for the comments, i surely enjoyed it reading.

The true value of gravity is it keeps us from flying off into space. Other than that it just weighs us down.