Recent content by magwas

  1. M

    Mechanical principles using D'lamberts

    http://en.wikipedia.org/wiki/D%27Alembert%27s_principle
  2. M

    Model of a catamaran for scantling purposes

    bump. I hope someone can help me with this.
  3. M

    Calculating K in the XYZ Space: A Homework Challenge

    You can check units also by hand. And you can practice.
  4. M

    Designing an Egg Mover: Brainstorming and Constraints

    For example it is suspended from springs. When the egg on that part, its mass makes the part to move down to the ground, but when the egg leaves it, it will be pulled up by the springs.
  5. M

    How Can I Design a Circuit to Manage and Distribute Stored Electrical Energy?

    Read these: http://www.allaboutcircuits.com/vol_1/chpt_14/1.html http://www.allaboutcircuits.com/vol_1/chpt_14/2.html Then tell here what you think will happen. After that we can help you with it. The forum rules are very strict on that helpers should not tell the solution, only help you to...
  6. M

    Calculating K in the XYZ Space: A Homework Challenge

    I used to avoid calculation errors by using a math package and always denoting the units. Your example in sympy: $ isympy Python 2.6.4 console for SymPy 0.7.0-git These commands were executed: >>> from __future__ import division >>> from sympy import * >>> x, y, z = symbols('xyz')...
  7. M

    Calculating K in the XYZ Space: A Homework Challenge

    you made a typo in vx, however your Px is okay. Your calculation is otherwise correct.
  8. M

    Designing an Egg Mover: Brainstorming and Constraints

    The speed of the egg in different intervals of the track should be carefully designed. The release mechanism could be something which is pushed down by the egg's mass, but goes up when it is rolled away.
  9. M

    Decending Lunar lander velocity

    Okay. You have the acceleration. Now you can come up with the speeds in different points of time. You can use off the self formulas in the book, just have to know which ones and in what order:)
  10. M

    Decending Lunar lander velocity

    You cannot add a work and a force, they are of different units. You have an initial speed. You have two forces acting on the spaceship: gravity and engine thrust. So what is the acceleration?
  11. M

    Calculating K in the XYZ Space: A Homework Challenge

    You should show some attempt at the solution. Without that we are not permitted to help. What about actually citing relevant equations and substituing them?
  12. M

    How Can I Design a Circuit to Manage and Distribute Stored Electrical Energy?

    Basically we are talking about a system consisting of three parts: 1.) A battery, storing energy 2.) A charger, converting incoming electricity to fill the battery 3.) Regulator for consumers. Choosing 1.) determines the output voltage of charger and input voltage of regulator. 2.) Would...
Back
Top