Question

Помогите решить.На завтра нужно.Общая масса 7-ми одинаковых листов кровельного железа равно 40 кг.Размер каждого листа 1*1,5м.Какова толщина листа?

Answer 1

40:7 = 5,74кг - масса одного листа

m = pV ; pж. = 7800 ; V = m/p = 5.74/7800=0.00074м^3

V = a*b*c ; c = V/ab ; c = 0.00074/(1*1.5) = 0.0005м

Answer 2

Calculation of the Thickness of the Roofing Iron Sheet

To determine the thickness of each sheet of roofing iron, we can use the given information about the total mass and the dimensions of the sheet.

Given: - Total mass of 7 identical sheets of roofing iron = 40 kg - Dimensions of each sheet = 1 m x 1.5 m

To find the thickness of each sheet, we can use the formula:

Density = Mass / (Area x Thickness)

Since the density of the roofing iron is not provided, we will assume a standard density value for roofing iron, which is approximately 7850 kg/m^3.

Let's calculate the thickness using this formula:

Step 1: Calculate the area of each sheet: - Area = Length x Width - Area = 1 m x 1.5 m = 1.5 m^2

Step 2: Calculate the density of the roofing iron: - Density = 7850 kg/m^3 (assumed value)

Step 3: Calculate the thickness of each sheet: - Density = Mass / (Area x Thickness) - Thickness = Mass / (Area x Density) - Thickness = 40 kg / (1.5 m^2 x 7850 kg/m^3)

Now, let's calculate the thickness using the given values:

Thickness = 40 kg / (1.5 m^2 x 7850 kg/m^3)

Using a calculator, the thickness of each sheet of roofing iron is approximately 0.0027 meters or 2.7 millimeters.

Therefore, the thickness of each sheet of roofing iron is approximately 2.7 millimeters.

Please note that the assumed density value of 7850 kg/m^3 may vary depending on the specific type and grade of roofing iron.