7 identical sheets of roofing iron have a mass of 490 kg. The size of each sheet is 1 * 1.5 m. what is the thickness of one sheet?

Body volume can be calculated using the formula:
V = m / ρ, where V is the volume of 7 sheets of roofing iron (m ^ 3), m is the mass of 7 sheets of roofing iron (m = 490 kg), ρ is the density of the roofing iron (ρ = 7800 kg / m ^ 3).
Let’s calculate the volume of 7 sheets of roofing iron:
V = m / ρ = 490/7800 = 0.063 m ^ 3.
Volume of one sheet: V1 = V / 7 = 0.009 m ^ 3 = S * h, where S is the area of the sheet (S = 1 * 1.5 m ^ 2), h is the thickness of the sheet.
Sheet thickness:
h = V1 / S = 0.009 / (1 * 1.5) = 0.006 m = 6 mm.
Answer: The thickness of the roofing iron sheet is 6 mm.