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zmey [24]
3 years ago
14

. A piston-cylinder device whose piston is resting on top of a set of stops initially contains 0.5 kg of helium gas at 100 kPa a

nd 25 ºC. The mass of the piston is such that 500 kPa of pressure is required to raise it. How much heat must be transferred to the helium before the piston starts rising?
Engineering
1 answer:
Delvig [45]3 years ago
8 0

Answer:

Qin = 1857 kJ

Explanation:

Given

m = 0.5 Kg

T₁ = 25°C = (25 + 273) K = 298 K

P₁ = 100 kPa

P₂ = 500 kPa

First, the temperature when the piston starts rising is determined from the ideal gas equations at the initial state and at that state:

T₂ = T₁*P₂/P₁

⇒  T₂ = 298 K*(500 kPa/100 kPa) = 1490 K

Until the piston starts rising no work is done so the heat transfer is the change in internal energy

Qin = ΔU = m*cv*(T₂-T₁)

⇒   Qin = 0.5*3.1156*(1490 - 298) kJ = 1857 kJ

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Tcecarenko [31]

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The process of making a function call itself is known as recursion. With the use of this strategy, complex problems can be reduced to more manageable, simpler ones. Recursion might be a little challenging to comprehend. Experimenting with it is the most effective way to learn how it functions.

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6 0
1 year ago
Turning a screw with a screwdriver pushes the screw into the wood. The force is __________ over many turns
IrinaK [193]

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repeated?

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not really sure what type of answer choices you have

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3 years ago
You are working as an electrical technician. One day, out in the field, you need an inductor but cannot find one. Looking in you
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Answer:

a) the inductance of the coil is 6 mH

b) the emf generated in the coil is 18 mV  

Explanation:

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A = πd²/4  

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we substitute

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b)

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Answer:

Explanation gives the answer

Explanation:

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