Question

в комнате на столе стоит целендрический стакан. определите изменение давления на дно стакана если в него налили 1 литр масла. площадь дна стакана равна 10см в квадрате, плотность масла равна 800кг/м в кубе

Answer 1

P = pgh
S = 10 см² = 0,1 м²
V = 1л = 0,001 м³
V = Sh ⇒ h = V / S = 0,001 / 0,1 = 0,01 м
P = 800 * 10 * 0,01 = 80 Па

Answer 2

Calculation of Pressure Change in the Glass

To determine the change in pressure at the bottom of the glass when 1 liter of oil is poured into it, we need to consider the properties of the oil and the dimensions of the glass.

Given information: - Area of the bottom of the glass (A) = 10 cm² - Density of the oil (ρ) = 800 kg/m³

To calculate the pressure change, we can use the formula:

Pressure (P) = Force (F) / Area (A)

The force exerted by the oil on the bottom of the glass is equal to the weight of the oil. The weight of the oil can be calculated using the formula:

Weight (W) = Mass (m) x Gravity (g)

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

Mass (m) = Density (ρ) x Volume (V)

Since the volume of the oil is given as 1 liter, we need to convert it to cubic meters:

1 liter = 0.001 cubic meters

Now we can substitute the values into the formulas to calculate the pressure change.

Step 1: Calculate the mass of the oil:

Mass (m) = Density (ρ) x Volume (V) = 800 kg/m³ x 0.001 m³ = 0.8 kg

Step 2: Calculate the weight of the oil:

Weight (W) = Mass (m) x Gravity (g) = 0.8 kg x 9.8 m/s² = 7.84 N

Step 3: Calculate the pressure change:

Pressure (P) = Force (F) / Area (A) = Weight (W) / Area (A) = 7.84 N / 0.001 m² = 7840 Pa

Therefore, the pressure change at the bottom of the glass when 1 liter of oil is poured into it is 7840 Pa.

Please note that the above calculations assume that the glass is completely filled with oil and there are no air bubbles or other factors affecting the pressure distribution.