# Projectile motion problem

1. Sep 16, 2007

### jpodo

I'm having trouble solving this one. Help would be much appreciated!

A fire hose held near the ground shoots water at a speed of 7.1 m/s.

a.) At what 2 angles could the nozzle point in order that the water would land 2.0 m away?

b.) why are there two different angles?

2. Sep 16, 2007

### genneth

What path does a projectile make? What's the equation of the path?

3. Sep 16, 2007

### jpodo

it is shot in an upward angle <90 degrees. I don't know the equation of the path.

4. Sep 16, 2007

### genneth

Projectiles always follow a parabola. Do you know the equation for a parabola as a parametric equation (i.e. expressing both x and y as functions of t)?

5. Sep 16, 2007

### jpodo

uh, I'm not really sure. How would you recommend solving this?

6. Sep 16, 2007

### genneth

A web forum isn't really the best substitute for a textbook or a teacher. Have you covered this in class? Is there a textbook that you can refer to?

7. Sep 16, 2007

### jmnew51

Is this a homework question?????

And yes, there are two different angles.

Hint...What is the shortest trajectory to a terget 2.0m away?

Jim

8. Sep 16, 2007

### jmnew51

Sorry for the Q about homework. Thread was moved while I was writing.

Jim

9. Sep 16, 2007

### jpodo

Yeah this is homework if it matters. I have no clue what the shortest trajectory is. I just need to know what equation pertains to this problem