# Physics Student

Members

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## 12 Followers

• Rank
type of nerd that also plays in a rockband

## Profile Information

• Location Sol c
• Interests Physics, Chemistry, Ducks

## Recent Profile Visitors

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1. ## Why specify the impulse?

Isn't the second a metric unit too, or does it exist in both systems with the exact same definition?
2. ## Why specify the impulse?

Let me tell you, „everybody outside russia“ is missing out on that.
3. ## Running List: Simple Suggestions

No, that would likely reduce the specific impulse because the exhaust gases would have a much higher molar mass (18 instead of 2 g/mol assuming Hydrolox) edit: wait, you said afterburner, so you want more thrust, not more ISP. Ok, you might get more thrust
4. ## Why specify the impulse?

@IncongruousGoat @PB666 @Pand5461 @mikegarrison That‘s all very interesting, thank you!

flatulence.
6. ## Why specify the impulse?

Simple question: As we all know: exhaust velocity = specific impulse * g What‘s the point of the specific impulse as a Unit? Why would anyone prefer knowing the specific impulse of an engine over the exhaust velocity? In other words: why do we need to specify this Unit to Earths Force of gravity? Has anyone ever used something different than Earh’s or Kerbin‘s force of gravity to specify the impulse?
7. ## How to calculate Delta V?

@steuben @Pand5461 still doesn‘tmake sense to me. The mass cancels out, so you can use whatever unit you want for that and your delta v result will simply have the same unit as the one you used for the exhaust velocity. It‘s really simple. this bugs me out, I made a topic on its own for this.
8. ## How to calculate Delta V?

The technical answer is: determine the wet mass and the dry mass of the stage and plug them into the rocket equation. delta v = exhaust velocity * ln(wet mass / dry mass) for some reason I don‘t understand, everybody gives us the specific impulse instead of the exhaust velocity. To get the exhaust velocity, you have to multiply the specific impulse by 9.81 m/s^2 serioussly, what‘s the point of the specific impulse? It looks like such a nonsense unit to me, why not give us the exhaust velocity right away?
9. ## One life - how far can you get?

this is my 2nd try, started a new save, build a new ship, landed on Eve but exploded on liftoff from Eve. Mun and Minmus Mun to Gilly Gilly to Eve The Disaster Points: Kerbol - 10 Eve - 20/20 Gilly - 20/10/10 Kerbin - 5 Mun - 10/20/10 Minmus - 10/20/10 add up to: 175

over
11. ## One life - how far can you get?

I assumed this challenge is a one time only deal, or can I make another entry with a new craft? I‘m still obsessed with doing an Eve return.
12. ## Make a wish... and have it horribly corrupted!

Granted, now everybody talks about nothing but Homestuck! I wish for Granit.

cheese
14. ## What do you guys drink while playing or do you drink at all?

Mostly tap water, occasionally beer. I don‘t drink coffee or tee.
15. ## Make a wish... and have it horribly corrupted!

granted, It rolls you over. I wish for a pleasant surprise.