- #1
Brunetto
- 7
- 0
I'm reviewing my old calculus textbook and I stumbled upon a proof of Kepler's First Law of Planetary Motion which uses vector valued functions along with all of the operations to demonstrate the material. I understand the math and how to to DO it but what I am struggling with is why.
It goes from:
v X h = GM u + c
and then does the dot product of both sides with r.
Why is the above equation "dotted" with r.
This is apparently found in most calculus textbooks but if it is not:
v is the velocity
u is the unit vector of direction
h is a constant vector of rXv
c is a constant vector of integrating u'
It goes from:
v X h = GM u + c
and then does the dot product of both sides with r.
Why is the above equation "dotted" with r.
This is apparently found in most calculus textbooks but if it is not:
v is the velocity
u is the unit vector of direction
h is a constant vector of rXv
c is a constant vector of integrating u'