Solución a Problema de Viga y Corredores

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Discussion Overview

The discussion revolves around a geometry problem involving a steel beam and two perpendicular corridors. Participants are exploring how to determine the minimum width of the second corridor that would allow the beam to pass from the first corridor to the second. The conversation includes various approaches to solving the problem, including geometric reasoning and mathematical equations.

Discussion Character

  • Exploratory
  • Mathematical reasoning
  • Debate/contested

Main Points Raised

  • One participant describes the problem and requests help with the translation and understanding of the geometry involved.
  • Another participant suggests drawing a diagram to visualize the problem, indicating the use of right triangles to analyze the situation.
  • A claim is made that the minimum width of the second corridor could be calculated using trigonometric functions, specifically involving angles and the sine and cosine ratios.
  • One participant proposes a specific answer of 5.25 meters, while another calculates approximately 8.45 meters, indicating a discrepancy in their approaches.
  • Confusion is expressed by a participant who questions the necessity of using the law of cosines and sines for the solution.
  • A later reply presents an equation for the minimum width and provides a calculation that results in approximately 5.25 meters, while also asking for clarification on the problem's premise and the target function.
  • Another participant inquires about simplifying the problem into a single equation.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the correct answer or the method to solve the problem, as multiple competing views and calculations are presented.

Contextual Notes

There are unresolved assumptions regarding the angles involved and the geometric configuration of the corridors. The discussion includes various mathematical approaches, but no single method is agreed upon as definitive.

madin
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the problem is

Una viga tiene 25m de largo, y un corredor, cuya anchura es de 13m, comunica con otro corredor que se encuentra perpendicular al primero ¿Qué anchura mínima tiene que tener el segundo corredor para que pueda pasar la viga del primer corredor al segundo?

sorry i don't know how translate into english better
someone please help?
 
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You have a steel beam, 25m long.
A corridor, 13m wide.
A second corridor, perpendicular to the first.
How WIDE must the second corridor be to allow the steel beam to pass through?

Translate, this is very basic. thanks
 
Draw a picture. Draw the first corridor as two parallel lines, say vertical. Draw the second corridor as two horizontal parallel line meeting the first two. Now draw the "steel bar" (a single line) just] making it around the corner- that should extend from one outer wall, touch the corner where the inner walls meet to the outer wall.

You should see two right triangles. One of them has a side of length 13 m. If the angle the bar makes with the wall is θ so the length of the hypotenuse (length of the bar in that corridor is 13/sin(θ). Okay, the length of the hypotenuse of the other right triangle is the length of the steel bar minus that: 25- 13/sin(θ).
Since the angle the bar makes with the opposite wall is the complement of θ, if we call the width of the other corridor (which is what we are trying to find), x, then we have x/cos(θ)= 25- 13/sin(θ). Now the problem is to find the SMALLEST corridor that will allow the bar to go around the corner. Write x as a function of θ and find the value of θ that minimizes x and find the value of x corresponding to that.
 
Is answer 5.25?
 
Last edited:
I get about 8.45 meters.


We can't tell what you did wrong if you don't show us what you did!
 
i am so confused.. maybe i am readying what you wrote wrong, is there a way to do this without law of cosins and sins

sry for horrible english!
 
is it okay to ask how you receive your answer?
 
Why assume a 45 degree angle?
 
  • #10
equation for minimum: x^{2/3} + 13^{2/3} = 25^{2/3}.
solving for x gives: x = (25^{2/3} - 13^{2/3})^{3/2} \approx 5.251080936.

what is the target function and not only the first order conditions, how to get there and, the most important thing What is the basic premise, to say, what is true problem? If someone could help me with this.. i'd really appreciate it. unles i am wrong
 
  • #11
May I have some comment please?

Is there a way to make this into one simple equation?
 

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