Question

В воде с глубины S = 4 м равномерно поднимают до поверхности камень объёмом y = 0,8 м3. Определить работу А по подъёму камня. Плотность камня и воды равны P1 = = 2500 кг /м3 и р2 = 1000 кг/м3 соответственно. Ускорение свободного падения считать равным g = 10 м/с2. - ответ выразить в кДж, округлив до целых ( надеюсь поможете )​

Answer 1

Ответ:Направим ось игреков вдоль подъема камня.

Работа A будет равна: A = mgh - ρgVh = h(mg - ρgV) = 4 м × (2500 кг/м³ × 0,8 м³ × 10 м/с² - 1000 кг/м³ × 10 м/с² × 0,8 м³) = 48 кДж

Объяснение:/

Answer 2

Calculation of Work Done to Lift the Stone

To calculate the work done to lift the stone from a depth of S = 4 m to the surface, we can use the formula:

Work (W) = Force (F) x Distance (d)

The force required to lift the stone is equal to the weight of the stone, which can be calculated using the formula:

Force (F) = Mass (m) x Acceleration due to gravity (g)

The mass of the stone can be calculated using its volume and density:

Mass (m) = Volume (V) x Density (ρ)

Let's calculate the work done step by step.

1. Calculate the mass of the stone: - The volume of the stone is given as V = 0.8 m^3. - The density of the stone is given as P1 = 2500 kg/m^3. - Using the formula, Mass (m) = Volume (V) x Density (ρ), we can calculate the mass of the stone: - m = V x P1 = 0.8 m^3 x 2500 kg/m^3 = 2000 kg. 2. Calculate the force required to lift the stone: - The acceleration due to gravity is given as g = 10 m/s^2. - Using the formula, Force (F) = Mass (m) x Acceleration due to gravity (g), we can calculate the force required to lift the stone: - F = m x g = 2000 kg x 10 m/s^2 = 20000 N.

3. Calculate the distance the stone is lifted: - The distance the stone is lifted is equal to the depth of the water, which is given as S = 4 m.

4. Calculate the work done: - Using the formula, Work (W) = Force (F) x Distance (d), we can calculate the work done to lift the stone: - W = F x S = 20000 N x 4 m = 80000 N·m = 80000 J.

Therefore, the work done to lift the stone is 80000 Joules (J).