In the context of mechanical systems, what does the term efficiency mean?

Conduction is thermal energy transfer by:_______.

adell [148]

Answer:

a. molecular interactions.

Explanation:

Conduction is thermal energy transfer by molecular interactions. Therefore, conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction while when it relates to thermal energy, it is known as heat conduction.

In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles. Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.

Some examples of conductors include metal, steel, aluminum, copper, graphite, etc.

Hence, conduction is thermal energy transfer as a result of the movement of electrons and collision between the molecules of an object.

5 0

4 years ago

Air enters the compressor of a regenerative gas-turbine engine at 300 K and 100 kPa, where it is compressed to 800 kPa and 580 K

Bad White [126]

Answer:

a) The amount of heat transfer in the regenerator, q = 114.12 kJ/kg

b) Thermal efficiency = 35.9%

Explanation:

The calculations are neatly handwritten and attached as files to this solution for easiness of expression and clarity. The cycle is also drawn on the T - S diagram and included in the attached files. Check the files below for the complete calculation.

I hope this helps!

3 0

3 years ago

trình bày những hiểu biết cơ bản nhất về thiết bị máy chụp X-quang trong môn học trang bị điện thiết bị y tế? trên cơ sở môn học

Damm [24]

Answer:

What? What does that even mean?

8 0

3 years ago

In urban area you can except

liberstina [14]

Answer:

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Explanation:

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5 0

3 years ago

El tiempo hasta que falle un sistema informático sigue una distribución Exponencial con media de 600hs. (Utilice 3 decimales par

Lesechka [4]

Answer:

La probabilidad pedida es $0.717$

Explanation:

Primero comencemos definiendo la variable aleatoria. Para nuestro problema, la variable aleatoria es la siguiente :

$X:$ '' El tiempo (en horas) hasta que falle un sistema informático ''

La variable aleatoria $X$ será entonces una variable aleatoria continua.

Sabemos que sigue una distribución exponencial con una media de 600 hs.

Esto se escribe :

$X$ ~ ε ( λ ) (I)

En donde λ es igual a la inversa de la media. Esto se escribe :

λ $=\frac{1}{E(X)}$

En donde $E(X)$ es la media de la variable. Por ende, si reemplazamos los datos del ejercicio obtenemos ⇒

λ $=\frac{1}{E(X)}$ ⇒ λ $=\frac{1}{600}$

Si reemplazamos el valor de λ en (I) obtenemos :

$X$ ~ ε $(\frac{1}{600})$

La función de distribución de $X$ (por ser una variable aleatoria exponencial) es :

$F_{X}(x)=P(X\leq x)=$ 1 - e ^ ( - λx) con x > 0 y $F_{X}(x)=0$ en caso contrario.

Si reemplazamos el valor de λ en la función de distribución de $X$ obtenemos :

$F_{X}(x)=P(X\leq x)=1-e^{-\frac{x}{600}}$

Dado que la variable aleatoria $X$ se distribuye de manera exponencial, el hecho de saber que el sistema ha estado funcionando sin fallas durante 400 hs no nos aporta ninguna información sobre lo que ocurrirá después. Esta característica se conoce como propiedad de perdida de memoria de la variable aleatoria exponencial. Entonces, la probabilidad pedida se reduce a calcular :

$P(X>200)$

Dado que saber que el sistema ha estado funcionando sin fallas durante 400 hs no nos dice nada sobre lo que ocurrirá instantes posteriores a esas 400 hs.

Calculamos entonces la probabilidad pedida :

$P(X>200)=1-P(X\leq 200)=1-F_{X}(200)=1-(1-e^{-\frac{200}{600}})=e^{-\frac{1}{3}}=0.717$

7 0

3 years ago