Chemistry, 10.11.2020 16:20 aydanbelle

1. Girona y Castellón están separadas 360 km. Un tren sale de Girona hacia Castellón con una velocidad de 108 km/h mientras que una hora más tarde, sale otro de Castellón
pero con una velocidad de 72 km/h.
a. ¿Cuánto tiempo tardaran en cruzarse los dos trenes? URGEE GRACIAASS

Answers: 2

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Answers

Answer from: gautemalaismylife

Ambos trenes tardarán 2 horas y 24 minutos en cruzarse.

Explanation:

Dado que el tren que sale de Girona lo hace una hora antes que el que sale de Castellón, y que circula a 108 km/h, al momento en que el tren que parte de Castellón inicia su recorrido la distancia entre ambos trenes, que en principio es de 360 km, se ha reducido a 252 km (360 - 108).

Así, luego de la primer hora de recorrido, ambos trenes se separan por 252 km. A la segunda hora, el tren de Girona ha recorrido otros 108 km, mientras el tren de Castellón ha recorrido 72 km, es decir, en total han acortado otros 180 km, con lo cual la distancia entre ambos ahora es de 72 km (252 - 180).

Ahora, para la última parte del recorrido, se debe dividir el horario. Así, el tren de Girona recorre 108 km en una hora, con lo cual, en 20 minutos, puede recorrer 36 km. A su vez, el tren de Castellón puede recorrer en el mismo tiempo 24 km, con lo cual, tras 2 horas y 20 minutos, la distancia entre ambos es de 12 km (72 - 60).

Para los últimos 12 km, debe dividirse el horario por un número menor. Así, en 4 minutos (60 / 15 = 4), el tren de Girona recorre 7.2 km (108 / 15 = 7.2), mientras que el tren de Castellón recorre 4.8 km (72 / 15 = 4.8). Así, dado que 7.2 + 4.8 es igual a 12, es decir, los km que faltaban para que ambos trenes se cruzaran, el tiempo en el cual ambos trenes tardarán en cruzarse es de 2:24 horas.

Answer from: Quest

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is $1s^{2}2s^{2}2p^{6}3s^{1}$ and electronic configuration of phosphorous is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$ .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

$3na + p \rightarrow na_{3}p$

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

Electrons are transferred from atoms of to atoms of this transfer makes the sodium atoms and the

Answer from: Quest

answer: a tank of height h is filled with water and sits on the ground. water squirts from a hole at a height y above the ground and has a range r. for two y values, 0 and h, r is zero. determine the value of y for which the range will be a maximum.

explanation:

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1. Girona y Castellón están separadas 360 km. Un tren sale de Girona hacia Castellón con una veloci...

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