Launching an object into OUTER space

[mrxyz]

About Earth's Escape Velocity; the place I have the problem is when I jump, I'm clearly not traveling at 11.2km/s and yet I'm escaping the Earth's gravity - although very slowly and for an extremely short time.

When a rocket is 20km above ground the escape velocity should be less since it's farther from Earth. So why does the rocket need to be traveling 11.2km/s.

On another note, that speed is so fast that I'm doubting my understanding of maths and measurements. Does 11.2km/s really mean 11.2 kilometres a second. That is unbelievably fast, especially in a direct upward direction!

 

[phinds]

About Earth's Escape Velocity; the place I have the problem is when I jump, I'm clearly not traveling at 11.2km/s and yet I'm escaping the Earth's gravity - although very slowly and for an extremely short time.

No, you most emphatically are NOT escaping Earth's gravity. Like much of the rest of your discussion, this just points to your ignorance of the fundamentals. I do not say this to be rude, but if you want to swim in the deep end of the pool you need to know how to do more than just splash around and make noise.

When a rocket is 20km above ground the escape velocity should be less since it's farther from Earth. So why does the rocket need to be traveling 11.2km/s.

Look up the radius of the Earth and figure out what % your have changed your height when you add 20km. Again, you are simply missing the basics.

On another note, that speed is so fast that I'm doubting my understanding of maths and measurements. Does 11.2km/s really mean 11.2 kilometres a second. That is unbelievably fast, especially in a direct upward direction!

yes

 

[Bandersnatch]

About Earth's Escape Velocity; the place I have the problem is when I jump, I'm clearly not traveling at 11.2km/s and yet I'm escaping the Earth's gravity - although very slowly and for an extremely short time.

When a rocket is 20km above ground the escape velocity should be less since it's farther from Earth. So why does the rocket need to be traveling 11.2km/s.

On another note, that speed is so fast that I'm doubting my understanding of maths and measurements. Does 11.2km/s really mean 11.2 kilometres a second. That is unbelievably fast, especially in a direct upward direction!

Escape velocity is the V₀ of an object at ground level. With this initial velocity and no other acceleration but gravity, it'll reach infinity and stop there. You certainly can't do that with jumping.

Km/s is right.
Compare Earth's orbital speed around the Sun(30km/s) or Solar system's orbital speed around the galactic centre(~250km/s). These are the kinds of velocities you encounter in outer space.

 

[mrxyz]

Escape velocity is the V₀ of an object at ground level. With this initial velocity and no other acceleration but gravity, it'll reach infinity and stop there. You certainly can't do that with jumping.

Km/s is right.
Compare Earth's orbital speed around the Sun(30km/s) or Solar system's orbital speed around the galactic centre(~250km/s). These are the kinds of velocities you encounter in outer space.

That was helpful, thanks :)

 

[micromass]

This thread has been sufficiently answered. It has gone severely off-topic, so this is locked.

 

[lisab]

Like I said, I've seen it having an effect on people I've known throughout college causing them to dropout because they thought they were incapable of studying complex subjects such as these. And in some cases making them settle with a simple, unsatisfying, undemanding and low paying jobs.

And other than that, decrease interest in physics/science causing less people to take it as a study option, making further research and breakthroughs in the field slower.

That's why.

Learning physics requires a good amount of humility and patience, and in my experience, most humans find those things difficult.

Breakthroughs are happening all the time. The pace of research is mostly set by money - qualified applicants are rarely the limiting factor.

 

[Astronuc]

Folks need to take a deep breath and chill - and stop with the personal remarks.

PF guidelines are quite clear -
https://www.physicsforums.com/showthread.php?t=414380

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