If you weigh rice or sugar that is only a few kilograms, you can use a
pendulum scale. If you are weighing sacked rice, of course you don't use a
pendulum, but use hanging scales or portable scales with a larger capacity. So
how do you measure the weight of the earth?
Luckily we have a Newton's law, with Newton's laws we can calculate the
weight of the earth, moon, and other planets, of course scientists can
calculate it using the scientific principles of physics that they master.
The earth where we stand is generally composed of 30% oxygen, 32% iron,
15% silicon, 14% magnesium, and other elements such as sulfur, nickel, calcium,
aluminum, and others. (soil/rocks/water are included in these elements)
Scientists calculate the density of the earth is 5.5 g/cm3, and using
Newton's equation the weight of the earth can be calculated as below:
F = G(M1*M2/R2)
F is the force of attraction between two objects.
G is a constant which is 6.67259 x 10-11m3/kg s2
M1 and M2 are two masses that attract each other.
R is the distance that separates two objects.
Assume that the Earth is one mass (M1) and a 1 kg ball is another object
(M2). The force between the two is 9.8 kg*m/s2 - we can calculate this force by
dropping a 1 kg ball and measuring the acceleration that the earth's
gravitational field applies to it (9.8 m/s2).
The radius of the earth is 6,400,000 meters. If calculated by the above
formula, we will find that the mass of the Earth is
6,000,000,000,000,000,000,000 kilograms (6 x 1024 kilograms, rounding down from
6,580,798,520,700,000,000,000,000 kilograms) or 6,580,798,520.
700,000,000,000,000 Tons.
ADS HERE !!!