Recent content by jeroen

  1. J

    Virtualization and creating computing power from existing machines

    Virtualization doesn't conjure 'computing power' out of thin air. It merely presents existing 'computing power' in a different way. And the conversion comes with some overhead.
  2. J

    Virtualization and creating computing power from existing machines

    Virtualization doesn't create computing power. A virtual machine is just software that emulates hardware. And computing power is not energy.
  3. J

    High School Compressed Chamber: Perfect Vacuum, Pull Apart?

    Expansion doesn't matter here. When there is a closed chamber then there will be an inside pressure and an outside pressure. The outside pressure will apply force to hold the chamber together. The inside pressure will apply force to take the chamber apart. Wether the chamber will come...
  4. J

    Calculate Wavelength from two sinusoidal waves

    First you need to understand how the cycle 'cycles'. What sequence of pressures will you encounter as you go through the cycle? Just name them high, low and medium. Plot this sequence on a piece of paper. Also draw the situation described in your post and plot th two distance-pressure...
  5. J

    What is the solution for the total resistance of the infinite ladder network?

    All you need to do is solve this equation: RL = 1/(1/R + 1/(2*R+RL)) And if R = 1: RL = 1/(1 + 1/(2+RL))
  6. J

    Undergrad Are these two lines intersecting?

    http://local.wasp.uwa.edu.au/~pbourke/geometry/lineline3d/
  7. J

    Undergrad Calculating Minimum Distance Between Two Co-ordinates on Earth

    http://www.astro.uu.nl/~strous/AA/en/reken/grootcirkel.html
  8. J

    How Far Can We Measure Star Distances Using Parallax with a 0.5 Arcsecond FWHM?

    Measuring a star's distance by parallax basically is solving a triangle: The base and the two angles at the base are known and the height of the triangle needs to be calculated. However, the angles aren't known exactly, there is a certain error. So a measured angle of 60 degrees might...
  9. J

    Undergrad Sky colour explanation by scattering

    Isn't the red light refracted less than the blue light? Blue light hitting the atmosphere is refracted downwards while the red light can follow a straighter path.
  10. J

    Gravitational Attraction Changing with Distance

    Delta means change. So delta velocity is the change of velocity. There is one equation that calculates force. The next calculation uses force to calculate accelleration. You can make one equation out of the two. The aim is to come up with two equations: v1 = v0 something dt r1 = r0...
  11. J

    Gravitational Attraction Changing with Distance

    t1 is the time dt is delta time r1 is range (or distance) f is force a is accelleration v1 is velocity dv is delta velocity dr is delta range r0 is the initial range v0 is the initial velocity t0 is the initial time m1 is the mass of the movable block m2 is th mass of the big block For simple...
  12. J

    Gravitational Attraction Changing with Distance

    You'd need to: -add a very small dt to t0 -calculate f from r -calculate a from f (or go straight from r to a) -calculate dv over dt and add it to v0 -calculate dr over dt and add it to r0 And then repeat this.
  13. J

    Measuring Force on a Spinning Ball: Simple Physics

    Assuming the thread is not attached to the tube, definitely! The weight will pull the thread one way while the ball will pull it the other way. If either of them pulls harder then the thread will move that way. You can use the lower ball to tell if the ball has more, less or the same...
  14. J

    Measuring Force on a Spinning Ball: Simple Physics

    A spring would be sufficient. Just measure the amount it is extended while you swig the weight and how much it extends per amount of force. What kind of equipment does your school have? With a spring, a sliding potentiometer, a multimeter, an oscilloscope or an electric graph you could put...
  15. J

    High School How Can You Safely Drop an Egg from a Balcony Without Gravity Slowing Devices?

    You might want to rewrite that sentence. ;)