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Homework Help: What kind of math do I include in THIS?

  1. Oct 17, 2008 #1
    Here is the problem. The only help I need with this is
    to determine the SPECIFIC type of defferential equations to use.
    (if any at all)
    i.e, 1st ODE's, ect.

    A rocket starts from rest on a ramp.

    Its propellant is consumed at a constant rate for a certain time.

    The propellent burns out after a certain time.

    Now the rocket is a projectile. It will land due to gravity at a certain D (distance) from ramp.
  2. jcsd
  3. Oct 17, 2008 #2


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  4. Oct 17, 2008 #3
    This site is great, but I have never studied Diff. Eq. and need
    to know what section I need to look at in order to solve the problem.

    I need to understand, not copy and past.
  5. Oct 18, 2008 #4


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    Why not post your problem in more detail, and show us how far you've gotten and where you're stuck?
  6. Oct 18, 2008 #5
    Read my first post.

    This is a problem I am putting together(it is not homework) and need help only on
    deciding if I need to include a differential equation.
    If I do, then what kind? I have never taken a class on D.E's, so need help narrowing down what type.

    The problem is conservation of momentum, and I am only working with variables at first.

    The first part is the hard part, as the M(mass) of the P(propellent) is changing with time.
    -this is the part that I believe I may need to include some ODE's.

    I have made the 2nd part to this problem easy, bc the fuel runs out, and now we are dealing with an easy projectile.
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