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  • Users: ncr7
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  1. N

    Motor Torque/Gearing

    I haven't spec'ed out motors before but I am looking to use a motor with the attached torque/speed characteristics. I am looking to use a gear with the following characteristics, Gear Reduction Ratio: 20:1 Nominal Output Torque: 6Nm Max Acceleration Output Torque: 9Nm Nominal Input Speed...
  2. N

    Frequency displacement

    I guess there would be a function in this case. I am working with inventor simulation studio and it gives a displacement at natural or modal frequencies. Although I am unsure if that data is even correct because inventor maybe giving meaningless data. Is there a way to analyze displacement if...
  3. N

    Frequency displacement

    So I have been trying to figure out how much an object is displaced when subjected to certain frequencies. If I know the modal frequency and max displacement at modal frequency can I find displacement at any frequency? I was thinking maybe using ratios you could do the following, modal...
  4. N

    Motor Torque

    Looking for a motor to turn a large cylinder. Say if I have a cylinder of radius 1007.54mm and mass of 2 tons, I would have a moment of innertia of 1.027x10^3 kg-m^2 This is from the general cylinder inertial equation, I = .5*m*r^2 The torque necessary to bring this to 30 deg/ 5 min is W=...
  5. N

    Momentum Wheel for Satellites

    Know of any?
  6. N

    Momentum Wheel for Satellites

    I am actually working on a project that requires this information too. I am looking into how to create a momentum wheel setup for a satellite now actually. If you find anything let me know, I'll do the same.
  7. N

    Dynamics Problem

    ok yeah I'm going to write it more throughly when I put it on paper. There wouldn't be the C because I have known points I'm integrating between. thanks for checking my work.
  8. N

    Dynamics Problem

    ok I think I got it. so taking \int_0 ^{10m} -0.05v^2 dx = \int_0^v v dv I get -0.05x|_0 ^{10} = ln|v||_{5m/s} ^v e^{1.11} = v getting 3.03 m/s I think that's right...
  9. N

    Dynamics Problem

    ok, I'm starting to have some weird mistakes because I have been on this problem to long lol... but I don't have two integration constants for t or v. I have the change in s from 0m to 10m. This would only really be able to give me where it's time when it comes to a complete stop which is part...
  10. N

    Dynamics Problem

    so I'll get \intdv=\inta dt (v2-v1) = -0.05v^{2}*t - 0 (since t_{0}=0) but I now have 2 unknowns though. v and t since I know the change in position shouldn't I do an integration over that? I'm just unsure how exactly it should be done
  11. N

    Dynamics Problem

    Hey I have been looking at the problem for a long time and for some reason I can't think of how to solve for it... I know I have to do some Calc to figure it out. Ok so here it is The acceleration of a particle is defined by the relation a = -0.05[v]^{2}, where a is expressed in...
  12. N

    Problem is bothering me

    I figured it out it ended up being a negative value because my y-component is negative which would make the magnitude of the vectors in the negative direction, and that gives me -79.79.
  13. N

    Problem with vectors

    so how do you figure it out? I'm not sure how you would go about doing it. Could you take 5.6t-4.5t^2 t(5.6-4.5t) t = 5.6/4.5 ? if so what happens with the 5.72 on the other side of the equation?
  14. N

    Problem with vectors

    The velocity of a particle moving in the xy plane is given by = (5.6 t - 4.5 t2) + 8.2, with in meters per second and t (> 0) in seconds. (a) What is the acceleration when t = 3.3 s? (b) When (if ever) is the acceleration zero? (c) When (if ever) does the speed equal 10 m/s? I got the...
  15. N

    Problem is bothering me

    figured out part b and c as I got to the end of the problem I saw they wanted it in velocity so I had to take the derivative of r and then solve for x and y values. I am still having trouble with d though...
  16. N

    Problem is bothering me

    This should be a really easy problem but for some reason I keep getting the wrong answers. The position of an electron is given by = 3.56t - 8.10t2 + 2.53, with t in seconds and in meters. At t = 1.22 s, what are (a) the x-component, (b) the y-component, (c) the magnitude, and (d) the angle...
  17. N

    Classes for next semester

    Well I did those already in my prior degree I was going for. I have enough social sciences I believe, and all my writing classes out of the way, so I just have all the fun ones left :u) I am going to head over to my advisor sometime next week. I got 2 tests tomorrow, Chem and American...
  18. N

    Average rate of change of a sphere

    yeah you will learn how to get it easier just by deriving the equation later. Is this a college course or high school? Just wondering because the part you posted in was precalculus. If you get to where you need help again, I wouldn't mind helping. I need a refresher now and then to make sure...
  19. N

    Average rate of change of a sphere

    hmm... do you have the answer for this one as well? and do you know how to do derivatives? This dose look like it means instantaneous.
  20. N

    Classes for next semester

    yeah I guess that is true. My calc prof this semester is only letting us use scientific calculators... which it has actually helped me with figuring out graphs better. I did here that a Dif Eq prof here at UB doesn’t let you use a calculator at all. I am going to have to talk to people here...
  21. N

    Average rate of change of a sphere

    that is the same as 1989.675, if you want to get an answer like that just keep pie separate.
  22. N

    Classes for next semester

    I am in Aerospace Engineering and I am about ready to schedule for classes next semester. I was thinking about taking Calc 3, Physics 1, Thermodynamics, Auto Cad, and probably something else. As I have been looking at this I am thinking it will be a tough semester. I might think about...
  23. N

    Average rate of change of a sphere

    well I guess the formula didn't work lol... how did you get yours up there?
  24. N

    Average rate of change of a sphere

    if r goes to 15 wouldn't it be wherever there is an r a 15 would go... I think you did it backwards... it looks as if you put "a" where "r" was supposed to go and "r" where "a" is supposed to go. P(a,V(a))=(15,14 137)\\ Let\ r=10 \lim_{r\rightarrow 15}...
  25. N

    Sun set from space

    hmm... I am not sure now if they can see the effects from space or not. I guess I would have to see when I get up there someday :u) or ask an astronaut whenever I get the chance. the way it explained it before was making it sound more like a filter, so I was thinking you would have to be on...
  26. N

    Sun set from space

    Awesome picture... Yeah I guess there is some... I think it is actually reflecting off the Earth probably ocean. I went to google and he told me all about it lol. I found that sun sets and sun rises are actually caused by the particles in the air such as dust, clouds and such. But it shows...
  27. N

    Sun set from space

    so it is more of an optical effect then... I guess that makes sense. I didn't think that it was but I thought it would be cool if it did.
  28. N

    Sun set from space

    I was wondering if anyone knew if you look at the Earth and see a sunset from space would you see the orange clouds from space? I think it would be cool to get a picture of the orange clouds from space... or something to that affect. I don't even know why I just thought of that lol. I am...
  29. N

    Law of multiple proportions

    yeah it was really hard to understand how that worked. Your help would be very much appreciated :u)
  30. N

    Law of multiple proportions

    Ok here is what I got out of Recitation from my Chem TA 1.12 = 28/25 28 is similar to 25 so he is saying it is more or less 50/50 so CxOy… we know that the amu for C is about 12, and the amu for O is about 16 12x = 16y 12(3) = 16(2) 36 is approximately 34 so the outcome is C3O2 Also...
  31. N

    Law of multiple proportions

    well the law of multiple proportions is Elements can combine in different ways to form different substances, whos mass ratios are small whole-number multiples of each other. there is an example in the book that shows there are twice as many atoms of O in NO2 than NO. They use the law of...
  32. N

    Law of multiple proportions

    Hey, I guess I posted this in the wrong string first I didn't notic the homework helper until after I put it in the chem forum. I have a question... it is actually from my homework. I am trying to figure out what exactly this problem is wanting. I am thinking a proportion of Carbon and...
  33. N

    Aerospace Jobs

    wow thanks for the information. I am glad I got to get some feed back from someone that is actually working in the field. So do you work for NASA? How do you like orbital mechanics? It sounds really interesting. I am really interested in Propulsion... I also think it would be neat to work...
  34. N

    Schools Grad school questions

    yeah, the Mars rovers is actually what sparked my interest in Aerospace Engineering. I did a paper on them along with a few other robotic systems in space, and as I did I decided to change my major. Luckily I ended up writing that paper my freshman year first semester lol.
  35. N

    Aerospace Jobs

    I am interested in aeronautical also, but not as much as astronautical. I do like the idea of working with wind tunnels doing aerodynamic research. Actually I really haven't found anything I don't like in the Aerospace Engineering field.
  36. N

    Schools Grad school questions

    If you like astronomy and like building things I would say going for Aerospace Engineering... but I am just an undergrad that isn't 100% sure about everything lol. I am going for Aerospace engineering starting this fall. I have had some science and math before changing majors at my prior...
  37. N

    Aerospace Jobs

    I was just wondering what kind of jobs that people have gotten with Aerospace Engineering... I would like to get a research and development job when I get out with at least my masters, although I might go ahead and get my Doctorate. What my ultimate goal is to be able to make traveling in space...
  38. N

    Programs Aerospace Engineering Degree and extra

    I am an excepted student at the University at Buffalo for Aerospace Engineering this upcoming semester... I am transferring from Alfred State with a few credits that will transfer... I am starting out as a sophomore. Anyway I was looking at the degrees they offer and I can get an Aerospace...
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