# Homework Help: Rocket with changing mass

1. Oct 13, 2008

### Ashleyz

Can I do a rocket problem with changing M without involving
an integral?
I am currently taking Calculus 1 and have not learned
that yet, although derivatives are no problem.

The Problem:

2 parts

1st part: find the max V when fuel runs out.

2nd part: find the R(range), where the rocket crashes when fuel runs out.

2. Oct 13, 2008

### jomoonrain

as far as i know,we have to make a communication with integral.
and i think in order to solve the problem you'd better state the conditions clearly.

3. Oct 14, 2008

### Ashleyz

This is not a problem that I need help solving, only, I need
help determinging if I MUST use an integral,

physics problems are two parts right, physics part, then math. Well I need help on the math.

it seems as if I should be able to use derivatives only for Newtons 2nd law.

4. Oct 14, 2008

### jdog

I think the short answer is, no. You will need to do an integral. Find a friend who has taken calc 2.

5. Oct 15, 2008

### Ashleyz

That answers my question. Thank you.