Question

Масса бревна 130 кг, объём его 0,2 м3. Будет ли оно плавать по воде?

Answer 1

Задача решается  простым  способом, составляешь уравнение, и находишь объем  дерева чтобы  оно плавало, если  оно меньше чем  дано то плавает, если  нет то оно будет тонуть...
решение на фото 

Answer 2

Calculation of Density

To determine whether the log will float in water, we need to calculate its density. Density is defined as the mass of an object divided by its volume.

Given: - Mass of the log = 130 kg - Volume of the log = 0.2 m^3

We can use the formula: density (ρ) = mass (m) / volume (V).

Substituting the given values into the formula, we get:

ρ = m / V ρ = 130 kg / 0.2 m^3

Calculating this, we find that the density of the log is 650 kg/m^3.

Determining if the Log Will Float

To determine if the log will float in water, we need to compare its density with the density of water. The density of water is approximately 1000 kg/m^3.

If the density of the log is less than the density of water, it will float. If the density of the log is greater than the density of water, it will sink.

Comparing the density of the log (650 kg/m^3) with the density of water (1000 kg/m^3), we can conclude that the log will float in water.

Therefore, the log will float when placed in water.