Optimizing Distance from a Cannon: Simplifying the Quadratic Formula

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SUMMARY

The discussion centers on optimizing the distance from a cannon using the quadratic formula, specifically addressing the angle theta required for maximum range. The correct angle determined is 70.5 degrees. Participants clarify that solving the quadratic equation is unnecessary, as the parameters indicate that the range (r) is always increasing, leading to no solutions for the quadratic. This insight simplifies the approach to the problem significantly.

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  • Basic knowledge of projectile motion principles.
  • Familiarity with trigonometric functions, particularly sine and cosine.
  • Ability to analyze mathematical conditions affecting solutions.
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Homework Statement


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Homework Equations


Hint given in problem statement
Quadratic formula

The Attempt at a Solution


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The correct answer is theta = 70.5 degrees. I'd like to know if I'm on the right track. Do I simply solve for theta? Is there a better approach that circumvents all of this messy algebra? Much appreciated!
 
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Last edited:
kalpalned said:
Is there a better approach that circumvents all of this messy algebra?
You do not need to solve the quadratic. If r is always increasing the quadratic has no solutions. What condition on the parameters leads to that?
 

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