- #1
vworange
- 9
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The answer that the book gives for the question:
What is the launch speed of a projectile that rises above the Earth to an altitude equal to the Earth's radius? Ans. 7.91 km/s
Now I have the question:
What is the launch speed of a projectile that rises above the Earth to an altitude equal to three times the Earth's radius?
So I use:
[tex]v_{f} = \sqrt(((2GM_{e})/(4R_{e}))[/tex]
Note:
G = 6.67x10^-11
Me = 5.97x10^34 kg
Re = 6.37x10^6 m
The resulting answer I get is 5.59 km/s. That equation works for an altitude equal to the Earth's radius, but not for my problem. Why not? What am I doing wrong?
What is the launch speed of a projectile that rises above the Earth to an altitude equal to the Earth's radius? Ans. 7.91 km/s
Now I have the question:
What is the launch speed of a projectile that rises above the Earth to an altitude equal to three times the Earth's radius?
So I use:
[tex]v_{f} = \sqrt(((2GM_{e})/(4R_{e}))[/tex]
Note:
G = 6.67x10^-11
Me = 5.97x10^34 kg
Re = 6.37x10^6 m
The resulting answer I get is 5.59 km/s. That equation works for an altitude equal to the Earth's radius, but not for my problem. Why not? What am I doing wrong?