- #1
ElectricMile
- 31
- 0
ok..haveing trouble understanding some examples in the book...
1) 1000kg rocket is fired striat up, need rocket to escape and never return. what speen does rocket need to escape from grav pull to never come back?(non rotating earth)
i know rocket can't stop so or it will be drawn back into earth. so...
K2+U2=K1+U1 is:
0+0=(1/2)m*v^2 - (GMm)/R)
whats with the 0+0?
then it goes to:
Vescape= v1 = SQRT(2GM/R)
howd they get to that equation??
i know the answers and stuff its in the book, i just don't know how they got to those equations
1) 1000kg rocket is fired striat up, need rocket to escape and never return. what speen does rocket need to escape from grav pull to never come back?(non rotating earth)
i know rocket can't stop so or it will be drawn back into earth. so...
K2+U2=K1+U1 is:
0+0=(1/2)m*v^2 - (GMm)/R)
whats with the 0+0?
then it goes to:
Vescape= v1 = SQRT(2GM/R)
howd they get to that equation??
i know the answers and stuff its in the book, i just don't know how they got to those equations