To calculate the mass of the steel used in the combustion chamber of a cylinder with a diameter of 50 cm and a wall thickness of 4mm, I need to first calculate the volume of the cylinder. The volume of the cylinder can be calculated using the formula:

V = πr²h

where V is the volume of the cylinder, r is the radius of the cylinder (which is half the diameter), and h is the height of the cylinder.

In this case, the radius is 25 cm (50 cm diameter / 2) and the height is unknown. Therefore, the volume of the cylinder is:

V = π(25cm)²h

Next, I need to calculate the volume of the steel used in the cylinder wall. The cylinder has a thickness of 4mm (0.4 cm), so the inner radius of the cylinder (r1) is:

r1 = r - t
r1 = 25cm - 0.4cm
r1 = 24.6cm

The volume of the steel used in the cylinder wall can be calculated using the formula:

Vw = πh(r² - r1²)

where Vw is the volume of the steel used in the cylinder wall, r is the outer radius of the cylinder, and r1 is the inner radius of the cylinder.

In this case, r is 25 cm and r1 is 24.6 cm. Therefore, the volume of the steel used in the cylinder wall is:

Vw = πh((25cm)² - (24.6cm)²)

Finally, I can calculate the mass of the steel used in the combustion chamber using the density of s235 steel, which is approximately 7.85 g/cm³.

The mass of the steel used in the cylinder is:

m = ρV
m = 7.85g/cm³(V + Vw)

where V is the volume of the cylinder, and Vw is the volume of the steel used in the cylinder wall.
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