Question

Чему равна масса сухой сосновой доски длина которой 4м ширина 20см толщина 4см? Плотность сосны 400кг/ м3

Answer 1

Длина L= 4 м, ширина а=0,2 м, толщина h=0,04 м. Масса m=L*a*h*400=4*0,2*0,04*400=12,8 кг.

Ответ: 12,8 кг.

Answer 2

Calculation of the Mass of a Dry Pine Board

To calculate the mass of a dry pine board, we need to use the given dimensions of the board and the density of pine wood.

Given: - Length of the board: 4 m - Width of the board: 20 cm - Thickness of the board: 4 cm - Density of pine wood: 400 kg/m³

To find the volume of the board, we multiply the length, width, and thickness:

Volume = Length × Width × Thickness

Substituting the given values:

Volume = 4 m × 0.2 m × 0.04 m

Simplifying:

Volume = 0.032 m³

Now, to find the mass of the board, we multiply the volume by the density:

Mass = Volume × Density

Substituting the given density:

Mass = 0.032 m³ × 400 kg/m³

Simplifying:

Mass = 12.8 kg

Therefore, the mass of the dry pine board with a length of 4 m, width of 20 cm, and thickness of 4 cm is 12.8 kg.