Pine boards loaded into a carriage have a mass of 12 tons. The size of one board

Pine boards loaded into a carriage have a mass of 12 tons. The size of one board is 800cm x 20cm x 2.5cm. How many boards are there in the carriage?

These tasks: M (total mass of pine boards) = 12 t = 12 * 10 ^ 3 kg; V (volume of one board) = a * b * c = 800 cm x 20 cm x 2.5 cm = 8 mx 0.2 mx 0.025 m.

Constants: ρс (density of dry pine) = 400 kg / m3.

To find the number of pine boards in the car, we use the formula: N = M / m = M / (V * ρс) = M / (a * b * c * ρс).

Calculation: N = 12 * 10 ^ 3 / (8 * 0.2 * 0.025 * 400) = 750 boards.

Answer: There are 750 pine planks in the car.