A gas contained within a piston-cylinder assembly undergoes three processes in series.
a. Process 1-2: Constant volume from p1 = 1 bar, v1 = 4 m3 to state 2, where p2 = 2 bar.
b. Process 2-3: Compression to v3 = 2 m3, during which the pressure-volume relationship is pV = constant.
c. Process 3-4: Constant pressure to state 4, where v4 = 1 m3.
d. Sketch the processes in series on p-V coordinates and evaluate the work for each process, in kJ.

a.

b.

c.

Explanation:

Given:

pressure at point 1,

pressure at point 2,

volume at point 1,

volume at point 3,

volume at point 2,  

pressure at point 2,

volume at point 4,

a.

Work done in process 1-2:

Being isochoric process:

and

so,

b.

Now we apply the ideal gas equation for the process 2-3:

Now work done in an isothermal process:

-ve means work is consumed by the system

c.

Now for the isobaric process 3-4 we apply the ideal gas law:

Since the process is isobaric so,

Now the work done:

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

its c i just checked it