424 reputation
519
bio website ericmenze.com
location Minneapolis, MN
age 29
visits member for 2 years, 8 months
seen 13 hours ago

I'm a Computer (Web) Programmer/Analyst based in Anchorage, AK and Minneapolis, MN. I use (among other things) ASP.NET, C# and SQL Server.

I build things. Bicycles, computers, websites, guitars, cars, motorcycles, sound sytems... lots of things.


Sep
12
comment What is the most efficient machine for translating gravitational potential energy of one mass into kinetic energy of a different mass?
Those don't transfer the energy from a falling weight into launching a projectile...
Sep
12
comment Would a rocket burn more fuel to get from Earth's surface to LEO, or to get from LEO to GEO?
What's the ratio for the fixed mass ship?
Sep
12
awarded  Benefactor
Sep
12
asked What is the most efficient machine for translating gravitational potential energy of one mass into kinetic energy of a different mass?
Sep
12
comment Would a rocket burn more fuel to get from Earth's surface to LEO, or to get from LEO to GEO?
I'm somewhat confused then. Does the delta-v take the mass-reduction of spent fuel into account? What is the comparison between the energy requirements of a theoretical fixed mass ship (say, an ion driven one) from Surface -> LEO vs LEO -> GEO? Your first paragraph seems like it's less for LEO -> GEO, but then your last one seems to say that it's more.
Sep
12
comment What is the general formula for a trebuchet?
What's the most efficient machine to transfer gravitational potential energy to kinetic energy?
Sep
12
asked Would it be economical to add a counterweight to rocket launches?
Sep
12
comment What is the general formula for a trebuchet?
Assuming a perfect efficiency then: $1/2*m_{projectile}*v^2 = g*h*m_{weight}$, so $h*m_{weight} = \frac{m_{projectile}*v^2}{2g}$, so to get 10kg to 6km/s I would need a 200,000kg counterweight dropping 91.8m?
Sep
12
comment What is the general formula for a trebuchet?
I have been playing with it, and asked for the formula from them, however it does not give me the initial velocity that I'm looking for.
Sep
11
asked What is the general formula for a trebuchet?
Sep
11
awarded  Teacher
Sep
11
answered How does the Sun's magnetic field continue to exist at such high temperatures?
Sep
11
comment Why are L4 and L5 lagrangian points stable?
Only L1 is stable in a non-rotating frame, yet I'm able to understand L2 and L3 clearly in the context of the rotation. L4 and L5 don't seem intuitively stable, and I'm looking for an intuitive explanation.
Sep
11
awarded  Nice Question
Sep
11
comment Could the Heisenberg Uncertainty Principle turn out to be false?
So in a universe without the commutative relation/HUP, where the commutative relation was sometimes zero / position and momentum could both be known, where's the paradox with EPR? You could just determine the values of both entangled particles, no paradox necessary.
Sep
11
accepted Could the Heisenberg Uncertainty Principle turn out to be false?
Sep
11
comment Why are L4 and L5 lagrangian points stable?
@AlanSE, that is not the case. Clearly a mass closer to the sun from the L3 would fall into it, farther would retract. The red shows the semi-stability in the L3 that will pull an object back into line with the two masses. Blue = top of hill, Red = bottom of hill.
Sep
11
comment Could we make a trebuchet that could launch objects to a stable orbit?
Yes, sorry it was difficult for me to word the question before these answers and comments. It doesn't have to be GS orbit, LEO, MEO, Polar, etc - just orbit. It's not as though I think one can actually be built, I'm more wondering how to translate this into a theoretical one to see how out of the ball park it is with today's materials, or if it is. Millions of tons counterweight would be doable, if the structure and bearing could support it. The 2-mile long arm seems to be a non-starter though.
Sep
10
comment Could we make a trebuchet that could launch objects to a stable orbit?
That's what I was looking for... what's the proper equation? QuickLaunch has a plan to launch single stage rockets at 6km/s, then the onboard rocket does the rest. They plan to do 1, 50, and 500 kg (approximate) payloads - how would I figure out the specifications of each payload to 6km/s for a trebuchet? Also, it looks like 90 degrees isn't desirable for orbital insertion.
Sep
10
comment Why are L4 and L5 lagrangian points stable?
I read that, just don't understand it. Can you explain it better?