and the great Archimedes already famous
during his lifetime for his scientific
ingenuity Archimedes repetition won him a very
special assignment. He had to discover whether
a royal crown made of pure gold or had been alloyed with some cheaper metal it was a
challenging task
As the precious crown gold could not *be* damaged in any way
the idea that saved Archimedes
came to him in the bath
the tub was full and when he got in he
began to overflow
so Archimedes took the crown and a lumb of
pure gold of the same weight if the crown was
of pure gold it would displace the same
amount of water as the lump of gold
however the crown displace far more
proving it was not a pure gold
so this was not the only problem solved
by the ingenious Archimedes to this day
he is regarded as the one of the best
minds of all times and his Archimedean
principal still stands* his fellow
scholars were not to be outdone they
designed the first world map with
longitude and latitude they discovered
that the earth is a sphere and Ptolemy calculate the movement
of the planet and other celestial bodies
in relation to it the list also includes
the first steam-powered machine and the
invention of the water pump in addition
the Greeks developed equipment such as
the catapult and protective vest for
their soldiers Archimedes formulated the
law of the lever laying the foundations
for the development of mechanics to the
friends of wisdom
a scientist named Archimedes discovered
the relationship between the bouyant
force with the weight of water being
displaced the relationship we call it as archimedes priciple
archimedes principles state the upward buoyant force that is exerted on
a body immersed in a fluid whether fully
or partially submerged is equally to the
weight if the fluid that the body
displaced and acts in the upward direction at
the center of mass of the displaced
fluid next we're going to show you
experiment related to archimedes principle. Okay, first measure the weight of this object with the help of
the spring balance and here the weight
of the object = one Newton. Second we
are going to put this small beaker into
this weighing scale and the weight of this
small beaker is 35 gram. Now we are going
to immerse this object into this beaker
of water and carefully observe the
reading of the spring balance. The weight of
the object is 0.9 Newton. So there is
a lost weight in the object
in the water. It's the real
way - the apparent weight so it's going
to be 1 N minus 0.9 N so the loss
in weight is 0.1 Newton. Now so we are
going to fill up this Eureka with water
so that we can measure the displaced
water when we immerse the object later
while we are waiting I want to tell you
guys that in this second part that
upward force is equal to the way of the
water displaced by it. So let's try this
again one more time. After the water
stopped dripping now we are going to
take the displaced water in the small
beaker into the weighing scale. As you can see
that the way the water with the small
beaker is 45 grams. So how we are going
to know the actual weight of the
displaced water so it's going to be 45
gram - to the 35 gram equals to 10 gram
or to be more precise is 0.1 Newton
From the experiment the upward force and
the weight of the liquid displaced are
both 0.1 Newton so they are equal and
Archimedes is correct
BYE!!!
