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Gre4nikov [31]
3 years ago
15

. During some actual expansion and compression processes in piston–cylinder devices, the gases have been observed to satisfy the

relationship PV n= C, where n and C are constants. Calculate the work done when a gas expands from 350 kPa and 0.03 m3 to a final volume of 0.2 m3 for the case of n = 1.5.
Physics
1 answer:
777dan777 [17]3 years ago
6 0

Answer:

-4728.49 J

Explanation:

It is an Adiabatic process. For an adiabatic process, work done can be calculated as follows:

W= \fracC{V_1^{1-n}-V_2^{1-n}}{n-1}

PV^n = C\\ (350 kPa)(0.03m^3)^{1.5}=1818.65

Substitute the values:

W=(1818.65)\frac{(0.03^{(1-1.5)}-0.02^{(1-1.5)})}{(1.5-1)} = (1818.65)\frac{(5.77-7.07)}{0.5}=-4728.49

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A small jet airplane has a total wing area of 77.5 m2 and a mass of 7.23 104 kg. (a) If this jet is in horizontal flight, determ
telo118 [61]

To solve this problem we must simply resort to Newton's second law as well as the relationship between pressure and force as a physical unit applied in a given area.

In mathematical terms the Weight can be expressed as

F_w = mg

Where,

m = mass

g = Gravitational Acceleration

We have the mass and the gravitational acceleration therefore the Weight is

m = 7.23*10^4Kg

g = 9.8m/s^2

Replacing we have

F_w = (7.23*10^4)(9.8)

F_w = 708540 N

In this way the pressure exerted according to the active Area is,

P = \frac{F}{A}

P = \frac{708540}{77.5}

P = 9142.45Pa

Therefore the pressure difference between the lower and upper surface of the wings is 9.14kPa

6 0
3 years ago
What is the si unit of force ​
Tcecarenko [31]

Explanation:

SI unit of force is <em>Newton</em>

3 0
3 years ago
Read 2 more answers
A subatomic particle created in an experiment exists in a certain state for a time of before decaying into other particles. Appl
dem82 [27]

Answer:

Δm Δt> h ’/ 2c²

Explanation:

Heisenberg uncertainty principle, stable uncertainty of energy and time, with the expressions

     ΔE Δt> h ’/ 2

     h’= h / 2π

to relate this to the masses let's use Einstein's relationship

      E = m c²

let's replace

     Δ (mc²) Δt> h '/ 2

the speed of light is a constant that we can condense exact, so

      Δm Δt> h ’/ 2c²

     

4 0
3 years ago
When an electron jumps from high-to low-energy levels:
AysviL [449]

Answer:

B. A wave of visible light is produced.

Explanation:

The visible light spectrum is in the centre of the Electromagnetic Spectrum, so any time an electron jumps from high to low levels of radiation, it has to cross through the visible spectrum.

I hope this is correct, and as always, I am joyous to assist anyone at any time.

5 0
4 years ago
The energy of a photon of light is __________ proportional to its frequency and __________ proportional to its wavelength.
icang [17]

Answer:

D) directly, inversely

Explanation:

The energy of a photon of light is directly proportional to its frequency and inversely proportional to its wavelength.

Frequency is the number of waves that passes through a point per unit of time.

Wavelength is the is the distance between successive crests or troughs on a wave.

 Mathematically, frequency is related to wavelength and velocity using;

             Energy   =  h x f

                      where h is the Planck's constant

                                  f is the frequency

         

                   Since c  = f ∧

where f is the frequency of the wave

           ∧ is the wavelength of the wave

           c is the speed of light

So;

                 f  = c/∧

  Therefore;

                E  = \frac{h c}{wavelength}

From the equation, we see an inverse relationship between E and wavelength and a direct one with frequency.

           

6 0
3 years ago
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