# HELP! How much weight does my water rocket need?

1. Apr 3, 2014

### Jwryan0504

Hi all!
I have entered a a water rocket competition. The rockets in this competition will be launched at 60 psi. We have to launch the rockets horizontally and to hit a round landing site 100 meters(approximately 328.084 ft) away and 30 meters (approximately 98.4252 ft) wide. I am not good at physics, so can anyone help me? How much should my whole rocket should weight to hit the center of the target? And also, how much water should i fill in?

2. Apr 3, 2014

### Travis_King

Horizontally, as in 0 degree inclination? or horizontally as in "some angle in the direction of the target" That's a big difference.

3. Apr 4, 2014

### Jwryan0504

Sorry, I forgot to add in: the rocket must be at a 45 degree angle from the ground. Thanks!

4. Apr 4, 2014

### Travis_King

Well, what work have you completed so far?

Have you identified any useful equations?

State your knowns and unknowns, so you can visualize the problem and use what you know to develop a solution.