Recent content by MikeTheLost

  1. M

    Why does a rock shatter a glass, but a bullet pass through.

    I don't think its that "high end", more likely the mechanical impact argument, as the behavior isn't unique to glass, mud (allowed to dry first of course) does the same thing and its a mechanical mixture. Key to the concept is that the divot is knocked out, not pushed out. Maybe also...
  2. M

    Why does a rock shatter a glass, but a bullet pass through.

    Could be heat from impact, could be some kind of mechanical failure related to the transfer of energy (one of the links at the bottom of the thread talks about similarity to a Newton's cradle, the half dozen metal balls suspended on strings where only the end ball moves on impact). The point...
  3. M

    Why does a rock shatter a glass, but a bullet pass through.

    I don't know the physics of the event, but armor piercing rounds are hardened steel or tungsten tipped bullets that transfer energy on impact to a small area making it explode from the rapid rise in temperature. Not friction as I think of it anyway, more directly related to the impact. A...
  4. M

    Any tips for a struggling Engineer major?

    Don't study alone, get into a study group, attend help sessions, consider a government job. Seriously, the world needs engineers of all levels, those who understand the whole concept including the underlying math, and people to work for them carrying out directed tasks that don't require global...
  5. M

    Calculating hydraulic motor sizes

    Thats a lot to read, but I'll mention a few things. Work = Energy HP isn't changed by gearing (except for frictional losses), torque is changed by gearing.
  6. M

    Fuel pressure change in closed fuel tank

    How are you measuring the pressure? BTW if you light a stick of dynamite it burns like the wood pulp it mostly is. Blasting cap or its equal or no boom.
  7. M

    Calculating hydraulic motor sizes

    The motors will need to be a bit oversized due to the uneven surface of the logs, but I still think you should be looking at any convenient motor about the size other people seem to be using successfully.
  8. M

    Is someone know how to calculate vertical G-force

    Sitting on the truck without the truck moving is 1 G. Once the truck is moving its gets much more complicated.
  9. M

    Is someone know how to calculate vertical G-force

    Lack of information on what is actually being attempted makes me predict failure. 4.5 tons will need professional attention to survive shipping. The term "shock absorber" continues to be used when whatever the actual device is, it won't be just a shock absorber, something else has to support...
  10. M

    Is someone know how to calculate vertical G-force

    Shock absorbers don't support any weight, they resist motion, with a force opposing the motion, from memory, of something like F = -kv*v. (sorry too lazy to figure out how to type v squared). Springs support weight, and again from memory, something like F= -S(x1-x0). The springs in my car are...
  11. M

    Why does a rock shatter a glass, but a bullet pass through.

    Tempered glass will shatter, non tempered you might get the bullet hole. Shooting with a bb gun makes holes in normal non tempered glass, like a house window at least used to have.
  12. M

    The Teapot Effect: Investigating the Causes

    After a month or so the teapot I use will start to dribble. After cleaning the spout the dribble mostly stops for another month or so. I will attempt to explain to the teapot its mistaken ways asap.
  13. M

    Focusing on a small image from a short distance

    Most cameras have a macro setting for close up photography, but I would not expect the quality to be close to a scanner either in pixels or color accuracy. Have you tried using a light table and magnifying glass like most professionals? Adapting a camera for use with a light table might be easy.
  14. M

    Maximize Power and Control with Dual Electric Hand Throttles for Your Bike

    I'm confident there WILL be issues, just that using a single hand control won't be at the heart of them.
  15. M

    Focusing on a small image from a short distance

    If image quality is important, why not use a slide scanner? A google of the following should help. 35mm slide scanner 35mm slide duplicator Macro photography
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