Thursday topic:
-We had a little quiz on Chapter 14: Satellite Motion ( CONCEPT-DEVELOPMENT PAGE) and everybody had the hand-out.
-We also answered the (Gravitational Potential Energy Questions).
Answer:
1. -3.13*10^10 J
2. -2.36*10^9 J
3. +2.98*10^9 Jjavascript:void(0)
4. 2.89*10^9 J
5. -1.18*10^11 J
-Ms. K also gave us New Formula(s):
Escape Velocity
r = Square root 2GM/R
Determining g of a Planet
g = Gm/R^2
Determining R, m, T
T = 2(3.14) Square Root R^3/R^2
Orbital Velocity
v = Square Root Gm/R
-We also had a hand-out about:
( 12.2 The Falling Moon )- It talks about Isaac Newton`s history of how he got things and especially the gravity.
( 14.5 Escaped Speed) - It also talks more on satellite positioning and orbit of earth to sun and etc. Masses, Radius and the Escaped Speed of particular planets in our solar system.
( Mass of a Central Object and Radius of Motion of a Satellite )- It shows the solution in finding the speed of a satellite.
v = 2(3.14)R/T
for m,
m = 4(3.14)^2R^3/GT^2
- lastly Ms. K gave us an assignment REVIEW Chapter 8. (1 - 7).
And that's all folks..the next scribe is Paullin? Camille? or Nailuj89?..
2 comments:
Did anyone check to see if the formulae are correct? I'd check if I were you.
Hi Jason
I would like you, on Ms. Kozoriz's request, to know that some of your formulas are incorrect. I will rewrite all 4 derived formulas for you and everyone else that didn't get them.
Escape Velocity/speed:
1.
Kinetic energy = Potential energy
Notation form: Ek = EP
1/2mvˆ2 = Gm₁m₂
V=√2Gm/r
2. Determining g of a planet:
Fg=mg Fg=Gm₁m₂/rˆ2
g=Gm/rˆ2
3. Determining r, m, T:
Fc=m4πˆ2r/Tˆ2 Fg=Gm₁m₂/rˆ2
4πˆ2r/Tˆ2=Gm₂/rˆ2
slove for m:
m= 4πˆ2rˆ3/GTˆ2
slove for T: Tˆ2= 4πˆ2rˆ3/Gm
* period and radius is all you need to use this formula
4. Orbital Velocity:
Fc=mvˆ2/r Fg= Gm₁m₂/rˆ2
Vˆ2=Gm₂/r
** also remember that force formulas have rˆ2 but enerfy formulas have only r radius.
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