Question

Какова масса сухой сосновой доски длинной 3 метра, шириной 20 сантиметров и толщиной 5 сантиметров? Плотность доски 510 кг/м кубический. Решите задачу!!!

Answer 1

3•20•5=300 см/куб- объём(V) m= p•V m=300•510= 153000 см/ куб

Answer 2

Calculation of the Mass of the Dry Pine Board

To calculate the mass of the dry pine board, we need to use the formula:

Mass = Volume x Density

Given: - Length of the board = 3 meters - Width of the board = 20 centimeters - Thickness of the board = 5 centimeters - Density of the board = 510 kg/m³

First, we need to convert the dimensions to meters: - Width of the board = 20 centimeters = 0.2 meters - Thickness of the board = 5 centimeters = 0.05 meters

Next, we calculate the volume of the board: - Volume = Length x Width x Thickness - Volume = 3 meters x 0.2 meters x 0.05 meters

Now, we can calculate the mass of the board: - Mass = Volume x Density

Let's perform the calculations:

Volume = 3 meters x 0.2 meters x 0.05 meters = 0.03 cubic meters

Mass = 0.03 cubic meters x 510 kg/m³ = 15.3 kilograms

Therefore, the mass of the dry pine board with a length of 3 meters, a width of 20 centimeters, and a thickness of 5 centimeters is approximately 15.3 kilograms.