$0.5 m L0.4 ml 0.8 m Q3 K=20 1 = 20 KN/m X = 0.3 m Spring lenght, l = 1 m W = ? 1/2 =π+²h = π (0.25)². 0.4 3 = 0.078 m³ √2 = ~(0.25)² 0.7=0.137 m³ xK Py.A Patm. A Patm = 105 A=πi+²= 0.196 m² Piston Aiz (a Calculate work done by the air * • By the drawing notice that the spring is already compressed at Q₁ = ✗ and gets more compressed at xr Kx + Patm. A A
Hi, I need help with the first part of the problem below because I'm very confused about how P1 and P2 should be calculated. If you look at my notes to solve the problem there is already a formula in place as I always thought the Patm should also be multiplied by the Area in the numerator, but it's not if I look at this specific tutorial solution given by my course but it's not explained why. I have done a while ago a very similar problem with using that formula in my notes and it gave me the right results, but it's not working for this one. Could you please help me understand why as I have a test coming soon?
Figure Q3 (see image attached) shows a cylinder and piston
enclosing air, the movement of the piston
being restrained by a compression spring of
stiffness 20 kN/m. The air is heated and
expands, the piston moving 0.3 m. The
free length of the spring is 1.0 m.
Calculate the work done by the air during
the process.
If the pressure , volume and internal energy
of air are related by the equation:
PV = 0.4 U, calculate the heat transfer to
the air for this process.
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