# Homework Help: Bottle Rocket Fuels ( )

1. May 31, 2012

### AstroPascal

Bottle Rocket Fuels (URGENT)

Assuming the same volume, which should travel higher - a bottle filled with a dense fluid or a bottle filled with a less dense fluid?

2. May 31, 2012

### LawrenceC

Re: Bottle Rocket Fuels (URGENT)

If you assume the nozzle is only convergent, the gas will exit the bottle at a mach number of unity.

What can you say about the speed of sound and the density of gases?
What is the upward thrust of the exiting gas in terms of exiting velocity?
How does the gas density affect the rocket weight?