# Really really on a projecton physics problem

• DragonReborn
In summary, the missile was fired at an angle of 37° to the horizontal and remained in the air for 7.60 seconds. The missile's initial velocity was 61.9 m/s and its range was 376 m.
DragonReborn

## Homework Statement

A missile is fired across level ground at an angle of 37.0o to the horizontal and
remains in the air for 7.60 s. Find the initial velocity and the range of the missile.

not sure

## The Attempt at a Solution

no inkling...I know that v0 cos 37 and v0 sin 37 will eventually lead to the range, but I have no idea how to get the initial velocity.

I even know the answer, just no idea how to do it lol.

v= 61.9 m/s, range = 376 m

Thanks!

Welcome to PF.

OK you got the range and you got the horizontal speed right?

So if the horizontal component is 61 m/s what does that mean that the initial velocity was at 37° ?

LowlyPion said:
Welcome to PF.

OK you got the range and you got the horizontal speed right?

So if the horizontal component is 61 m/s what does that mean that the initial velocity was at 37° ?

thanks for the welcome! sorry for not being clear earlier, the answer for the problem is: v= 61.9 m/s, range = 376 m

I have no idea how to get to that point. All I can glean out of the problem is the angle and time, not enough to plug into any formulas.

the initial velocity appears to be 76.4, and I could get the displacement pretty quick with that info. How would you normally get initial without knowing what the final velocity was?

To find the initial velocity, first set up an equation to find the y component of the initial velocity. The equation for this is Y=Yo+Vot+(1/2)at^2. In this case Vo=Vosin37 and your displacement (Y-Yo) is zero since you are starting and ending on the same level ground. Therefore your equation will look like: 0=Vosin(37)*(7.6)+(1/2)*(-9.8)*(7.6)^2. Solving this for Vo will give you 61.879 or 61.9 m/s. You then can use this to find the range which is x=Vot.

thank you so much! I have one question though, I don't have Y=Yo+Vot+(1/2)at^2 on my formula list. Instead, I have displacement = v0t + 1/2 at^2, which is essentially the same thing without an extra v0 in the beginning. What is the extra v0 for? I often see the above equation in my physics book too...thanks again.

nm I think I get it, its just combining the cos + the regular displacement equation...

Your equation is actually the exact same as mine. When you say the extra Vo do you mean an extra Yo. Either way, your displacement is the same as Y-Y0 which could just equal Y. You have it right so don't worry.

thanks!

## 1. What is the purpose of this project on physics?

The purpose of this project is to investigate and analyze a specific physics problem in order to gain a deeper understanding and potentially find a solution or explanation.

## 2. What methods and tools will be used to conduct this project?

The methods and tools used in this project will vary depending on the specific physics problem being investigated. Generally, it will involve mathematical calculations, experiments, and data analysis using specialized equipment and software.

## 3. How does this project contribute to the field of physics?

This project contributes to the field of physics by adding to the existing knowledge and understanding of a particular problem. It may also provide insights and potential solutions that can be applied to other related problems or theories.

## 4. What are the potential challenges or limitations of this project?

The potential challenges or limitations of this project may include technical difficulties with equipment or data, limitations in resources or time, and the complexity of the problem itself. It is important to acknowledge and address these challenges in order to ensure the accuracy and validity of the results.

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The results of this project will be communicated through various means such as scientific publications, presentations at conferences, and online platforms. It is important to share the findings with the wider scientific community in order to foster collaboration and further advancements in the field of physics.

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