# Homework Help: Rocket Lab @ Angles.

1. Oct 6, 2008

### Hellsing834

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

I need to predict how far a rocket will land given:

Delta Y = 2.032 (80 in ) - Height it will be shot from.
Angle - 35 (degrees)
My Average velocity is 23.3 m/s.

I need to repeat this for angles 40-60 [Increments of 5]

2. Relevant equations

I have these equations that i am using.

Vy = V(average) x sin (theta)
Vx = V(average) x cos (theta)
X = V(average) x cos (theta) * Time
T = (2*V(average))/ g

3. The attempt at a solution

For the first scenario i did the calculations and i am getting 55.3 m, but i know that is not right because we shot the rockets today, and mine did not even go past 40m. I did 3 trials, and each time it was between 20-40 m.

2. Oct 6, 2008

### LowlyPion

Maybe the 23m/s is not accurate?

3. Oct 6, 2008

### Hellsing834

I believe that it is accurate because i compared these results with the same lab we did last year, and the answer is close.

4. Oct 6, 2008

### LowlyPion

Perhaps you would do better to use a range equation that was more of the form:

$$Range = \frac{V_o^2*Sin2\theta}{g}$$

This of course does not take into account the height you launch it from.

5. Oct 6, 2008

### Hellsing834

See, even with that equation, my answers comes in the 50's like my original.

6. Oct 6, 2008

### LowlyPion

Unfortunately it doesn't take into account how long the rocket burns. Since it is a rocket it will accelerate over a distance that may be greater than 2m.