# Homework Help: Projectile motion problem

1. Jul 10, 2009

### lauren333

1. The problem statement, all variables and given/known data

If a certain cannon can shoot a projectile a distance of 275m when it is aimed at 66.0 degrees above the horizontal, what is the maximum range the cannon could achieve with the same projectile, and at what angle should it be aimed to do this?

2. Relevant equations:
x = Vo(Cos@)t , where @ = angle
X=Xo + (Vox)t

3. The attempt at a solution: answers given in text book: 370 m, 45 degrees...I'm still trying to solve the problem, and not knowing time (t) is what leaves me stuck

Thank you very much for your help! I really appreciate it! :)

2. Jul 10, 2009

### Redbelly98

Staff Emeritus
Welcome to PF

Many text books actually discuss the range of projectiles, and give an equation for range as a function of angle and velocity.

3. Jul 10, 2009

### kallistos

Are you sure you have all the equations necessary to solve the problem, by the way?

Last edited by a moderator: Apr 24, 2017
4. Jul 11, 2009

### jontyjashan

Moderation Note: Complete solution removed. Hootenanny

Last edited by a moderator: Jul 11, 2009
5. Jul 11, 2009

### rock.freak667

jontyjashan, you did not need to post the full solution.

6. Jul 11, 2009

### jontyjashan

why shouldnt i post full solution

7. Jul 11, 2009

### Redbelly98

Staff Emeritus
It's against the rules of Physics Forums! Also, it doesn't help the OP think about and learn the material, which is the reason behind the rule.

From the Homework Help section at https://www.physicsforums.com/showthread.php?t=5374:

Last edited: Jul 11, 2009