Paper
6
Gravity variation from the equator to the poles.
Ramin Amir mardfar
(1995)
Gravity variation from the equator to the poles.
Rotation of earth around itself causes a centrifugal force on things,
which is on the opposite direction of gravity and causes to decreas of
weigh of them. This force is more stronger in equator, so weight of a
thing in there is a littie lighten then the weight of the seme thing in
other point of the earth. The escape from center force causes that while a
thing has 1000gr weight in the pole, it will be 996gr in the equator. in
other words, we see about 4gr decrease per kilogramm. Thats, one person
with 70kg in the pole, will be 69.7kg in the equator. The latitude of the
pole is 90� and 0� for the equator. If we transfer a thing with 1kg from
latitude of 45� to the equator difference of weigh for per kg will be
less than 4gr. Therefor we see that the changs of gravity on the earth
isn't so much and causes in significent difference in thing's
weight. In 1671 an astronomer group set off from Paris (45� north) to
Cayenne island (5� north) for a commission. Jean Richer, the head of this
group, had a precise pendulum clock with him in this trip. He noticid that
clock was postponed 21.1 minutes per 24 hours. Richer didn't know why. But
about 15 years later, Issac Newton said that the reason, is the difference
of gravity in the mentioned zone. After tath, pendulum bacame a precise
facility for measuring difference of gravity in various points of the
earth. Becouse in near places to eaother, spring-balance coudn't show
insignificant difference of gravity but pendulum couldeasly. It seemed
that pendulum can make visual differences like a magnifying glaas. How a
pendulum can do such a work? When we weigh a thing with a spring-balance,
and compare the difference of weight with other zones, we only have done
this once and registen therefore, the differens will be little and
insignificant. It pendulum moves only once, the difference of time, will
be shown much little. i.e. difference of time for moving of pendulum once
in equator and pole is significant and showe the same little difference of
the spring-balance. But, when pendulum moves twice (go and return) it will
delay little each time and because of gather together of these, we will
see the difference twice larger. i.e. pendulum has magnifyed it twice, so
we can see it easier. If pendulum moves three times, the difference will
be threefold. Because of delay of pendulum each time (go and return), in
therr times (go and return) it will delay three times and these
differences will collect on each other and it's shown threefold finally.
So it's possible to compare the difference of gravity in varios zones with
each other. Because the of pendulum's move (go and return) to being the
magnification more, and can register and study much little difference of
gravity in neibour zones simply. Imagine if pendulum go and return once
per second, has many times it'll go and return in 24 hours and it's
possible to obtain the magnification. This great magnification was that
noticed Jone Richer in 1671 to the difference of gravity in Paris and
Cayenne island. While if he wanted to do this test even with the most
precise balance of that time, he coudn't get a conclusion and coudn't show
any difference of gravity between Cayenne island and Paris.
There is a set similar to a pendulum in animals body which show's the
little difference of gravity with a great magnification. This set, is the
same blood circulation system with motive factor of heart. Blood is moving
like pendulum alternately. Each round of circulation of blood is similar
to onetime go and return of a pendulum. Blood, keeps aloof from the
surface of earth alternately like a pandulum and comes nearer to it again
and repeats this duty hundreds of time each day and night. So, the little
difference of gravity will have a lot of effect in work of this set as
well as it had in work of a pendulum. If blood circulatory only once
during the life of an animal, the little difference of gravity
couldn't impress on it and acted as a spring-balance. But
because blood goes up and down from the surface of earth in thowands of
time, so like a pendulum, the effect of little difference of gravity in
this set will collect thousand of time and will be a great amount.
Let's suppose, an animal has one kg in it's body and
it's heart circulates this blood a round in it's body per 10
seconds. Let's suppose we transfer this animal from the equator
to a place near to the pole. There, it's blood will be heavier
about 4gr. i.e. it's heart must enter 4gr additional force when it wants
to cary the blood up and return it. If it did this only once, it hadn't
any problem. But the heart of this animal, repeat this oer to secondes
i.e. 24gr per minute or 1440gr per hour or 34560gr per day and night i.e.
the heart of this animal in the pole, must carry 34.5kg more load than
equtor.
If animal be larger and have more blood, this additional load will be more
than this too. Therefore we see that, with a much little change in gravity
it be imposed a lot of additional force to the animal's heart. This is why
tall and big animals such as giraffa and elephant can only live in
equatoral pionts of earth, because of less gravity in there (little
amount) than other places and their heart can send blood to farther
distances from the surface of earth. So in practice we see that much
little increase of gravity has noteworthy effect in animal bulk.
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