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theEric Group Title

(Classical Mechanics (with calc, but algebra could help)) Hi! I am stumped, but I feel like I should be able to get to the answer... A pitcher has a throwing speed that is a function of the angle the ball is thrown at. The problem is below, along with what I've thought of.

  • 10 months ago
  • 10 months ago

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  1. theEric Group Title
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    \(\sf\Large\color{orange}{The\ Problem}\) "A baseball pitcher can throw a ball more easily horizontally than vertically. Assume that the pitcher's throwing speed varies with elevation angle approximately as \(v_0cos\dfrac{1}{2}\theta_0\), where \(\theta_0\) is the initial elevation angle and \(v_0\) is the initial velocity when the ball is thrown horizontally. Find the angle \(\theta_0\) at which the ball must be thrown to achieve maximum (problem a:) height and (problem b) range." That's the part I need help with.. \(\sf\Large\color{orange}{My\ thoughts...}\) I've thought of using \(v_y = \left(v_0\ \cos\left(\dfrac{1}{2} \theta_0\right)\right)\sin\theta_0+gt\) and setting \(v_y=0\). I tried to do the same with \(v_y^2=v_0\ \cos\left(\dfrac{1}{2}\theta_0\right)+2gh\), but to no avail. I also thought of looking at \(y(t)\) and finding the maximum of its function, but that looks to difficult. I'm a slow learner, but I like to learn! Thanks for any help!

    • 10 months ago
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    (A) You can use \[V_{yfinal}^2 = V_{yinitial}^2 + 2(-g)(Y_{final} -Y_{initial}) \] where \[V_{yfinal} = 0m , Y_{initial} = 0 m/s, V_{yinitial} = (v_0cos(\frac{1}{2} \theta_0))sin\theta_0\] and solve for Yfinal

    • 10 months ago
  3. theEric Group Title
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    Thank you very much! I can't believe I missed that - especially after writing that equation down! Thank you!

    • 10 months ago
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    (B) You can find the time it takes to reach max height then multiple by two to get the total time in the air. Once you have the total time you can use the equation for average velocity in the x-direction to find the range: \[V_x = \frac{Range}{Total Time}\]

    • 10 months ago
  5. theEric Group Title
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    Thank you very much :)

    • 10 months ago
  6. PhysicsGuru Group Title
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    your welcome

    • 10 months ago
  7. theEric Group Title
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    Wait.. I have to re-ask this. We could find \(Y_\text{final}\), but not \(\theta_0\)! I have found \(Y_\text{fintal}\).

    • 10 months ago
  8. PhysicsGuru Group Title
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    From the look of the problem setup there are no numbers... it looks like you are finding a formula for \[\theta_0\]

    • 10 months ago
  9. theEric Group Title
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    Right.. I have to solve for what \(\theta_0\) would be to attain a maximum height. And, after that, I have to solve for a \(\theta_0\) that would give the maximum range. They will both be functions of \(v_0\). I should be able to calculate \(\theta_0\) in each case by knowing \(v_0\) and using substitution. I posted a new question, if you want to look there!

    • 10 months ago
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is replying to Can someone tell me what button the professor is hitting...

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