Question

Физика 7 класс Какая часть айсберга находится над водой, если он плавает в пресной воде? Плотность воды 1000кг/м3. Привидите решение

Answer 1

Плотность льда 900 кг/м³

Выталкивающая сила равна разности силы Архимеда и силы тяжести. Vpжg-Vgтg=Vg(рж-рт) . Так как надо найти только часть айсберга, то отбрасываем объём и ускорение свободного падения. рж-рт. 1000кг/м³-900кг/м³=100кг/м³. Теперь полученную плотность делим на плотность воды. (100кг/м³)/(1000кг/м³)=1/10.

Ответ: 1/10 

Answer 2

Part of the Iceberg Above Water in Freshwater

When an iceberg floats in freshwater, the portion of the iceberg that is above the water's surface can be calculated using the principle of buoyancy and the densities of water and ice.

The key concept to consider here is Archimedes' principle, which states that the buoyant force on an object submerged in a fluid is equal to the weight of the fluid displaced by the object.

To calculate the portion of the iceberg above water, we can use the following formula:

Fraction of iceberg above water = (Density of ice) / (Density of water)

Where: - Density of ice = 917 kg/m^3 - Density of water = 1000 kg/m^3

Substituting the values into the formula: Fraction of iceberg above water = 917 / 1000

Calculating the fraction: Fraction of iceberg above water = 0.917

This means that approximately 91.7% of the iceberg's volume is below the waterline, and therefore, about 8.3% of the iceberg's volume is above the water when it floats in freshwater.

This calculation is based on the densities of ice and freshwater, and it provides an understanding of the proportion of the iceberg that is visible above the water's surface.