Recent content by Rappaccini

  1. R

    Tipping Trucks: Does Speed Matter?

    Ignoring acceleration's and angular momentum's respective effects on the friction of the tires, there is NO relationship, JohnDubya. I do not think it is helpful for us to consider the bump, which is an upward force, scenario. It only complicates things.
  2. R

    Tipping Trucks: Does Speed Matter?

    There is no such thing as a wind that blows in one direction for more thana few seconds, but, assuming that however the truck moves, the wind remains perpendicular, we have a case... The work performed by the truck against the wind is Displacement * Force = Mag(dis)Mag(For)cos(theta)...
  3. R

    How much work does the fish do?

    Since no one seems willing to help right now, I'll continue the calculation, whether or not it's right so far. Cur[Fis(t)] = [(ðsin(t))^(cos(t))]i + [sin(t)^4]j + 1k[/size] Fis'(t) = [-sin(t)]i + [cos(t)]j + 0k[/size] Therefore, Cur[Fis(t)] * Fis'(t) =...
  4. R

    How much work does the fish do?

    Let's say there's a creek. Down in the creek, there is a current. The vector field that describes this current is Cur[x y z] = [(ðy)^x]i + [(y^4)+(xyz)]j + (2z + e^z)k[/size] Nota bene: ð = pi[/size] The force is in Newtons. X, Y, and Z are the spatial dimensions in...
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