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curiosoperoinutil.com :: Ver Tema - Pregunta 286: Puff, ¡qué presión! (elviruca)
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Pregunta 286: Puff, ¡qué presión! (elviruca)
https://curiosoperoinutil.com/forum/viewtopic.php?f=10&t=1950
Página 1 de 3

Autor:  Nano [ Mar 14 Nov 2006, 00:00 ]
Asunto:  Pregunta 286: Puff, ¡qué presión! (elviruca)

Sea el sistema de la figura. Consta de un cilindro vertical, de paredes diatérmanas de 20 cm de radio. En su interior, confinado por un émbolo de 1 kg de masa, se encuentran 250 g de aire.

Sabemos que el sistema se encuentra, en un día ISA+15 (International Standard Atmosphere), a una altura igual al doble del producto del día, mes y año en que nací, partido por mi edad y redondeado al metro.

$m[1]

El sistema se encuentra en equilibrio termodinámico. Se pide:

1. La altura a la que se encuentra el invento.
2. La lectura de presión del manómetro M de la figura (en nº entero de Pascales), así como la explicación de los pasos hasta llegar al resultado, para eliminar las respuestas al azar.
3. La respuestas a las preguntas mostradas al introducir el resultado de 2 en la dirección: http://perso.wanadoo.es/mrr_nano3/pon_a ... resion.jpg

Todo ello en un mismo post.

Suerte.

*Nota: Sería de agradecer que no me hackeárais el servidor para conseguir la imagen.

Autor:  De Molay [ Mar 14 Nov 2006, 00:07 ]
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Autor:  Nano [ Mar 14 Nov 2006, 00:10 ]
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Autor:  Heimy [ Mar 14 Nov 2006, 00:12 ]
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Autor:  Adama [ Mar 14 Nov 2006, 00:13 ]
Asunto:  Re: Pregunta 286: Puff, ¡qué presión!


Autor:  koldo85 [ Mar 14 Nov 2006, 00:13 ]
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Autor:  Nano [ Mar 14 Nov 2006, 00:15 ]
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Autor:  Nano [ Mar 14 Nov 2006, 00:16 ]
Asunto:  Re: Pregunta 286: Puff, ¡qué presión!


Autor:  Heimy [ Mar 14 Nov 2006, 00:20 ]
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Autor:  mikoalilla [ Mar 14 Nov 2006, 00:25 ]
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Autor:  luciabs [ Mar 14 Nov 2006, 01:04 ]
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Autor:  Nano [ Mar 14 Nov 2006, 01:07 ]
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Autor:  astrocitoma [ Mar 14 Nov 2006, 01:10 ]
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Autor:  Nano [ Mar 14 Nov 2006, 01:15 ]
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Autor:  astrocitoma [ Mar 14 Nov 2006, 01:17 ]
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Autor:  Nano [ Mar 14 Nov 2006, 01:21 ]
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Autor:  luciabs [ Mar 14 Nov 2006, 01:33 ]
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Autor:  astrocitoma [ Mar 14 Nov 2006, 01:36 ]
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Autor:  Heimy [ Mar 14 Nov 2006, 01:38 ]
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Autor:  astrocitoma [ Mar 14 Nov 2006, 01:43 ]
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Autor:  Heimy [ Mar 14 Nov 2006, 01:44 ]
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Autor:  Kramer [ Mar 14 Nov 2006, 03:19 ]
Asunto: 

Siento destriparte la pregunta, pero lo haré para aquellos que la física no es su fuerte (se lo debo a elviruca&co. que me echaron una mano en una anterior pregunta :wink:).

La altura es 2*26*1984/11=9378.9, redondeando 9379m.

Para 2) en teoría habría que aplicar todo el coñazo de las fórmulas:

$m[1]

Con

T = To − Lh,

# To = 288.15 K (Standard sea level temperature)
# Po = 101300 Pa (Standard sea level pressure)
# L = 0.0065 K/m (Initial Lapse rate)
# g = 9.8 m/s2 (Gravitational acceleration)
# R = 287 m2/s2/K (Gas constant for air)

No obstante es mucho más sencillo que eso, debido a que el manómetro a l ser cerrado mide sólo p = ρ.g.h. y no p = p0 ± ρ.g.h, es decir mide diferencia de presiones con la atmosférica (que pillo Nano :twisted: )

Por tanto basta hallar la presión que será p=F/S=mg/(pi*r2)=1.9,8/(pi.(0.2)^2)=78Pa

Ahora ya podéis ir a la página...

Pd: Como pago por la ayuda se acepta la voluntá o un buen gin-tonic :wink:

Autor:  lesmurff [ Mar 14 Nov 2006, 03:50 ]
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Autor:  koldo85 [ Mar 14 Nov 2006, 04:20 ]
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Autor:  Kramer [ Mar 14 Nov 2006, 05:02 ]
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Autor:  Kramer [ Mar 14 Nov 2006, 05:04 ]
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Autor:  Nano [ Mar 14 Nov 2006, 10:12 ]
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Autor:  X-Pacer [ Mar 14 Nov 2006, 11:00 ]
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Autor:  Quin [ Mar 14 Nov 2006, 11:38 ]
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Autor:  Nano [ Mar 14 Nov 2006, 11:55 ]
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Nacieron en el mismo siglo.
Uno nació tres años después de la muerte del otro.
Compartían profesión.
Uno de ellos, si estuviera hoy vivo, probablemente ayer hubiera estado con Fernando Alonso.

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