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Roman55 [17]
3 years ago
13

The total energy of a system remains unchanged during a cycle. a)- True b)- False

Engineering
1 answer:
frosja888 [35]3 years ago
5 0

Answer: True

Explanation: It is correct that during a cycle the energy of the system remains unchanged. Total energy consist of the initial energy and the final energy in a system and both remain equal in a system whether they are in cycle or not  ans also according to the law of conservation of energy ,total energy cannot be destroyed or created. Thus the while a cycle goes on energy will remain the same.

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Air is compressed in an isentropic process from an initial pressure and temperature of P1 = 90 kPa and T1=22°C to a final pressu
ivolga24 [154]

Answer:

a) T_2=569.35 K

b)Work done per kg of air=196.84 KJ/Kg

Explanation:

Given: \gamma =1.4 for air.

P_1=90 KPa ,T_=22^\circ C,P_2=900 KPa

We know that  

\dfrac{T_2}{T_1}=\left (\frac{P_2}{P_1}\right )^{\dfrac{{\gamma-1}}{\gamma}}

So  \dfrac{T_2}{295}=\left (\frac{900}{90}\right )^{\dfrac{{1.4-1}}{1.4}}

T_2=569.35 K

(a) T_2=569.35 K

(b)Work for adiabatic process

  W=\frac{P_1V_1-P_2V_2}{\gamma -1}

We know that PV=mRT for ideal gas.

 W=mR\frac{T_1-T_2}{\gamma -1}

Now by putting values

work per kg of air=0.287\times \frac{295-569.35}{1.4 -1}

Work w=-196.84 KJ/Kg    (Negative sign indicate work given to input.)

So work done per kg of air=196.84 KJ/Kg

4 0
3 years ago
Disc brake rotors that are too thin cannot handle as much heat and will experience ___________.
konstantin123 [22]

Answer:

brake fade

Explanation:

Among the most frequent problems in the brake disc is their overheating. When there is overheating, the temperature of the disc rises to critical values, thus the brake pad starts to slide with respect to the disc, and the efficiency of the brake system decreases to a minimum.

Overheating of the brake disc is detected when inspecting the parts. Steel is the most common base material in the creation of brake discs. When heated, the material becomes its color. A disc of steel at critical temperature, turns bright orange and later on cooling becomes purple.

If a color change is seen on the brake discs when inspecting, a service station must be contacted without delay for an in-depth examination. After detecting the problem, the brake discs and pads will be changed in a mandatory way.

6 0
4 years ago
Imagine the arc of a football as it flies through the air. How does this motion illustrate classical mechanics?
BigorU [14]

Answer: Maybe A

Explanation:

7 0
1 year ago
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Thoughts about drinking and driving
poizon [28]

Answer: it’s very bad behavior and can be dangerous

Explanation:

8 0
3 years ago
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What does WCS stand for? A. Western CAD System B. Worldwide Coordinate Sectors C. World Coordinate System D. Wrong CAD Settings
Ray Of Light [21]

Answer:

The correct answer is C. World Coordinate System

Explanation:

The World Coordinate System has to do with that coordinate system which is fixed in the activities of the CADing. There is a default system in which we can refer to them as soon as we want to manipulate the objects and add new elements.

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