Digital Magazine "Maths and Science Adventure" Digital Magazine "Maths and Science Adv_1st issue | Page 4

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4
The experiment
done and describe
by the Cypriot
team
ment for his time,
2500 years ago.So
Eratosthenis was the
first person to calcu-
late Earth’s dimen-
sions , that’s why he is
considered the creator
of mathematical geog-
raphy. March 20
(Spring Equinox) and
September 23
(Autumn Equinox) can
be described as the
beginning of Spring
and Autumn respec-
tively.On those exact
dates, the Sun is di-
rectly above the Prime
Meridian.As a result
day and night have
the same duration in
every place on
Earth.On those days,
it is a good opportuni-
ty to repeat Eratos-
thenis’ experiment
because we know ex-
actly where the Sun’s
rays are vertical on
Earth’s surface.It’s
remarkable that this
experiment is included
in the list with the 10
amazing science ex-
periments in the histo-
ry of Physics .
At 20/3/17 11:55 a.m.
,in Lakatamia and in
our school. The Sun’s
rays are vertical to the
Earth;s surface so we
try to repeat Eratos-
thenis experiment
every year.
244 cm
Shadow’s length: ΤΑ =
169 cm
Distance from the
equator: ΤΙ=3886.6 km
(from google earth)
Calculations
tanφ= ΤΣ/ΤΑ= 169/244
and φ=34.7 ο
ΤΙ/φ= Perimeter /360,
Perimeter=40313.5216
km
Earth’s Ray R= Perime-
ter/2π = 6416.1 km
Measurements (length given R=6371
Object’s Height: TA= km)
Fluids with strange properties
Introduction:
The distinction of
the three physical
states of matter is
based on macro-
scopic observations
DIG IT AL
MAGAZINE
and in particular on
the ability of each
material body to
maintain its shape
and volume.
In this work, refer-
ence is made to the
fluid (liquid) which
under conditions ac-
quires solid charac-
teristics. Such fluids
are
called
non-
Newtonian fluids.
Fluid is any sub-
stance that exhibits
continuous defor-
mation, therefore its
molecules are able
to transfer momen-
tum and kinetic en-
ergy from one to an-
other and flow as we
can see at the photo
to the left.
The basic question
that emerges is of
what element differ-
entiates the flow be-
tween liquids. What
is the property that
determines the dif-