Question

ДАЮ МНОГО БАЛЛОВ!!! На песке лежит толстый стальной лист, площадь основания которого 1м2. Вычисли давление листа на песок, если его масса равна 71 кг. Насколько увеличится давление, если на лист поместить каменную глыбу массой 1,5 т? Принять g=9,8 Н/кг.

Answer 1

Ответ:на 14004,2  Па

Объяснение:р=F/S=mg\S= 71кг*9,8 Н/кг/1 м²=695,8 Па

р=1500кг*9,8Н/кг/1 м²=14700 Па

Δр=14700Па-695,8 Па=14004,2 Па

Answer 2

Calculation of Pressure on Sand

To calculate the pressure exerted by the steel sheet on the sand, we can use the formula:

Pressure = Force / Area

Given that the mass of the steel sheet is 71 kg and the area of the base is 1 m², we need to find the force exerted by the steel sheet on the sand.

To find the force, we can use Newton's second law of motion:

Force = Mass * Acceleration

The acceleration due to gravity is approximately 9.8 m/s². Therefore, the force exerted by the steel sheet on the sand is:

Force = Mass * Acceleration = 71 kg * 9.8 m/s²

Now, we can calculate the pressure:

Pressure = Force / Area = (71 kg * 9.8 m/s²) / 1 m²

Let's calculate the pressure:

Pressure = (71 kg * 9.8 m/s²) / 1 m² = 696.8 N/m²

Therefore, the pressure exerted by the steel sheet on the sand is approximately 696.8 N/m².

Increase in Pressure with the Addition of a Stone

To calculate the increase in pressure when a stone with a mass of 1.5 tons (1500 kg) is placed on the steel sheet, we need to find the additional force exerted by the stone.

Using the same formula as before:

Force = Mass * Acceleration = 1500 kg * 9.8 m/s²

Now, let's calculate the additional force:

Force = 1500 kg * 9.8 m/s² = 14700 N

To find the new pressure, we need to add the additional force to the previous force exerted by the steel sheet:

New Pressure = (Force + Additional Force) / Area = (71 kg * 9.8 m/s² + 14700 N) / 1 m²

Let's calculate the new pressure:

New Pressure = (71 kg * 9.8 m/s² + 14700 N) / 1 m²

Using the given value of acceleration due to gravity (g = 9.8 N/kg), we can simplify the calculation:

New Pressure = (71 kg * 9.8 m/s² + 14700 N) / 1 m² = (696.8 N + 14700 N) / 1 m²

New Pressure = 15396.8 N / 1 m²

Therefore, the new pressure exerted by the steel sheet and the stone on the sand is approximately 15396.8 N/m².

The increase in pressure is the difference between the new pressure and the previous pressure:

Increase in Pressure = New Pressure - Previous Pressure = 15396.8 N/m² - 696.8 N/m²

Let's calculate the increase in pressure:

Increase in Pressure = 15396.8 N/m² - 696.8 N/m² = 14600 N/m²

Therefore, the pressure on the sand will increase by approximately 14600 N/m² when the stone is placed on the steel sheet.

Note: The sources provided do not contain relevant information for this specific calculation.