Longitude was. Determining longitude requires knowing the exact time of day, which was difficult prior to modern clocks. The source book below tells the story of Englishman John Harrison's life-long pursuit of building a reliable clock and its importance to navigation.
The study of how the world works
<h2>
Answer: 7020.117 m/s</h2>
Explanation:
The velocity of a satellite describing a circular orbit is<u> constant</u> and defined by the following expression:
(1)
Where:
is the gravity constant
the mass of the massive body around which the satellite is orbiting, in this case, the Earth
.
the radius of the orbit (measured from the center of the planet to the satellite).
This means the radius of the orbit is equal to <u>the sum</u> of the average radius of the Earth
and the altitude of the satellite above the Earth's surface
.
Note this orbital speed, as well as orbital period, does not depend on the mass of the satellite. It depends on the mass of the massive body (the Earth).
Now, rewriting equation (1) with the known values:
Answer:
The value is 
Explanation:
From the question we are told that
The atom fraction of metal A at point G is 
The atom fraction of metal A at a distance 5000nm from G is 
The number of atoms per
is 
The diffusion coefficient is 
Generally of the concentration of atoms of metal A at G is

=> 
=> 
Generally of the concentration of atoms of metal A at a distance 5000nm from G is

=> 
The concentration gradient is mathematically represented as

=>
=>
Generally the flux of the atoms per unit area according to Fick's Law is mathematically represented as

=> 
=> 
Generally if the cross-section area is 
Generally the number of atom crossing the above area per second is mathematically is

=> 