Recent content by zero_delta

  1. Z

    Thickness of material to support a heavy load

    While considering the center of mass of the battery to be the load point, and the battery would be on the center of the supporting material, y is the maximum amount of bending from a neutral flat position. These types of equations are great, but this is just about as simple as they get. The...
  2. Z

    Thickness of material to support a heavy load

    For P use weight. I prefer SI units and in this case it would be 10kg * 9.8 m/S^2 or 98 N. The dimensions (L, w, t) are for the plastic or whatever supporting material you wish to use.
  3. Z

    Thickness of material to support a heavy load

    google "strength of materials + bending stress" and youll see equations like: E = (P*L^3)/(4*w*y*t^3) For E you can use modulus of elasticity. P is the load, L is the length, w is the width, t is the thickness and y is the deflection or bending. Look up E, solve for t.
  4. Z

    How to calculate flash point of mixture?

    Hi, a precise calculation, based in thermodynamics, is quite involved. However, if you Google something like "Effect of Additives on the Flash Point of Flammable Liquid" you will find that you can begin by adding water to the alcohol to raise its flash point (for example, a mixture of .7 water &...
  5. Z

    High School Is change of phase always reversible?

    The only example that comes to mind is that of a thermosetting polymer.