Missile Defense System - Collide Missiles

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AI Thread Summary
The discussion focuses on designing a missile defense system to intercept an incoming missile using a Patriot Rocket. Key calculations involve determining the time of flight (Δt), horizontal distance (Δx), and the required acceleration magnitude (A) for the rocket. Participants emphasize the importance of establishing the relationship between the missile's and rocket's positions to solve for Δt, noting that the rocket's initial horizontal velocity is not constant. The conversation highlights the need for accurate equations of motion to find the necessary parameters for successful interception. Overall, the thread centers on the mathematical modeling required for effective missile defense.
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Homework Statement



You are designing a missile defense system that will shoot down incoming missiles that pass over a perimeter defense post. The set-up is shown below. An incoming missile passes directly above the defense base. Radar at the base can measure the height, h, and speed, v1, of the incoming missile. Your Patriot Rocket is set to fire at an angle of θ = 46.0 degrees from vertical. You design the Patriot Rocket so the magnitude of its acceleration is given by:

a2 = A e−bt

where A can be set on your Patriot Rocket as it is fired, and b = 0.10 s-1. The direction of your Patriot Rocket's vector acceleration stays at the same angle, θ, for the entire trip. If an incoming missile passes over the defense base at a height of 4.60 km and at a constant speed of 740.0 m/s (this means that v1 is constant), solve for the value of A your Patriot Rocket must have in order to hit the incoming missile. You will also need to enter results from intermediate steps of your calculation, including the time ∆t in between launch and impact, and the horizontal distance ∆x from the launch station to the impact position.

http://lon-capa.mines.edu/res/csm/csmphyslib/Mechanics/Kinematics/2D_Projectiles/MissileDefenseSystem.jpg

Part A) Find Δt
Part B) Find Δx
Part C) Find A

Homework Equations



a1x(t) = 0 m/s^2
v1x(t) = v1x(0) = v1
x1(t) = v1*t

a2x(t) = a2*sin\theta = A*e^(-b*t)*sin\theta
v2x(t) = v2x(0) -(A/b)*e^(-b*t)*sin\theta
x2(t) = v2x(0)*t +(A/b^2)*e^(-b*t)*sin\theta

a2y(t) = a2*cos\theta = A*e^(-b*t)*cos\theta
v2y(t) = v2y(0) -(A/b)*e^(-b*t)*cos\theta
y2(t) = v2y(0)*t +(A/b^2)*e^(-b*t)*cos\theta

The Attempt at a Solution



Part A) I know that when the missiles collide x2(t) = x1(t). I tried to use that relationship to find the change in time, but I am not sure what v2x(0) is (the initial velocity of missile 2 in the x-direction). I think as soon as I figure out part A I will be able to do the other parts. I am just a bit stuck.
 
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The picture is inaccessible.
 
MissileDefenseSystem.jpg


Does this link work?
 
1. It is not a constant velocity. You have to find the displacement equation.
2. You have the vertical distance to cover before interception.
3. Assuming level flight of the missille, the distance covered by the missile is equal to distance traveled by the patriot, that is patriot horizontal component.
 
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