Answer:
Follows are the solution to this question:
Explanation:
In point a:
Place of particles






In point b:
when 
the Particle velocity
In point c:
Calculating the Particle acceleration:

Answer:
it's because the eclipse hides the moon and Venus and the sun
Explanation:
I found it
The development of the microscope, a key innovation in the field of technology, lead to the development of Cell Theory, a key innovation in the field of science.
Answer:
R=9.
C=(2,-2,0).
Explanation:
Lets try to find how
can be written in the form of
, since then its radius R and center of coordinates C=(a,b,c) would be easily recognizable.
Since we have the terms -4x and +4y, they seem to have come from the terms
and
, and we would need to take care of the extra +4 by substracting then. More explicitly:
, as we had originally with the x terms
, as we had originally with the y terms
Which means:

Or, putting all together:


So our radius is 9 and the center is (2,-2,0).
Explanation:
a chip on your shoulder is an example