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2 years ago

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Physics

1 answer:

Delvig [45]2 years ago

5 0

The correct option is A. the isobaric process represented by the PV diagram

<h3>What is isobaric process?</h3>

An Isobaric method is a thermodynamic revolution taking place at consistent pressure. The period isobaric has been derived from the Greek words “iso” and “baros” indicating equal intimidation.
As such, the continued pressure is obtained when the importance is expanded or acquired. This basically neutralizes any pressure change due to the transfer of heat.

In an isobaric procedure, when the heat is transferred to the system some work is done. Nevertheless, there is even a change in the internal energy of the system.
This additionally means that no amounts as in the first law of thermodynamics evolve zero.

To learn more about isobaric process, refer to:

brainly.com/question/13040268

#SPJ9

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A train whistle is heard at 300 Hz as the train approaches town. The train cuts its speed in half as it nears the station, and t

spin [16.1K]

Answer:

The speed of the train before and after slowing down is 22.12 m/s and 11.06 m/s, respectively.

Explanation:

We can calculate the speed of the train using the Doppler equation:

$f = f_{0}\frac{v + v_{o}}{v - v_{s}}$

Where:

f₀: is the emitted frequency

f: is the frequency heard by the observer

v: is the speed of the sound = 343 m/s

$v_{o}$ : is the speed of the observer = 0 (it is heard in the town)

$v_{s}$ : is the speed of the source =?

The frequency of the train before slowing down is given by:

$f_{b} = f_{0}\frac{v}{v - v_{s_{b}}}$ (1)

Now, the frequency of the train after slowing down is:

$f_{a} = f_{0}\frac{v}{v - v_{s_{a}}}$ (2)

Dividing equation (1) by (2) we have:

$\frac{f_{b}}{f_{a}} = \frac{f_{0}\frac{v}{v - v_{s_{b}}}}{f_{0}\frac{v}{v - v_{s_{a}}}}$

$\frac{f_{b}}{f_{a}} = \frac{v - v_{s_{a}}}{v - v_{s_{b}}}$ (3)

Also, we know that the speed of the train when it is slowing down is half the initial speed so:

$v_{s_{b}} = 2v_{s_{a}}$ (4)

Now, by entering equation (4) into (3) we have:

$\frac{f_{b}}{f_{a}} = \frac{v - v_{s_{a}}}{v - 2v_{s_{a}}}$

$\frac{300 Hz}{290 Hz} = \frac{343 m/s - v_{s_{a}}}{343 m/s - 2v_{s_{a}}}$

By solving the above equation for $v_{s_{a}}$ we can find the speed of the train after slowing down:

$v_{s_{a}} = 11.06 m/s$

Finally, the speed of the train before slowing down is:

$v_{s_{b}} = 11.06 m/s*2 = 22.12 m/s$

Therefore, the speed of the train before and after slowing down is 22.12 m/s and 11.06 m/s, respectively.

I hope it helps you!

7 0

3 years ago

Which of the following is an example of kinetic energy?

Elza [17]

The answer is C) a rolling bowling ball because kinetic energy is the energy of movement and potential energy is the energies of the others, since there are not in movement. i hope this helps.

7 0

3 years ago

What is a simple pendulum?

soldier1979 [14.2K]

Answer:

A pendulum is weight suspended from a pivot so that it can swing freely

8 0

4 years ago

What element is left over after the nuclear us reaction splits into different elements?

SVEN [57.7K]

Answer: A Radium

Explanation:

Thorium-232 is an alpha-emitting radionuclide, which decays to radium-228, which is a beta emitter with a half-life of about six years.

7 0

3 years ago

What is the weight of a 2.06 kg text book. show work please

salantis [7]

The weight of anything is (mass) x (gravity in the place where the thing is).

   Gravity on Earth is about 9.8 newtons per kilogram, so on Earth,
   the weight of the book is

(2.06 kg) x (9.8 N/kg) = <em>20.19 newtons</em> .

Another way to get around it is:

   On Earth, 1 kg of mass weighs about 2.205 pounds, so on earth,
   the weight of the book is

   (2.06 kg) x (2.205 pounds/kg) = <em>4.54 pounds </em>.

7 0

4 years ago