Question

1. На глубине 15 м находится давление 10(в 8 степ) Па. Чему будет равно давление на глубине 3 м? 2.Автомобиль запполнили грузом. Площадт 1 колеса - 50 см( в квад.), давление, которое оказывает автомобиля на дорогу = 130 кПа. Найти массу груза.

Answer 1

1)
15/10^8=3/х
х=2*10^7 Па=20 МПа
2)50см²=50*10^-4 м²
p=F/S
F=m*g
p=(m*g)/S
m=65кг

Answer 2

Answer 1:

To find the pressure at a depth of 3 m, we can use the formula for hydrostatic pressure:

Pressure = Density x Gravity x Depth

However, we need to convert the pressure given at a depth of 15 m from pascals to kilopascals. Since 1 kilopascal (kPa) is equal to 1000 pascals (Pa), the pressure at a depth of 15 m is 10^8 Pa = 10^5 kPa.

Now, we can calculate the pressure at a depth of 3 m:

Pressure = Density x Gravity x Depth

Since the density and gravity are constant, we can ignore them for this calculation. Therefore, the pressure at a depth of 3 m will be the same as the pressure at a depth of 15 m, which is 10^5 kPa.

Answer 2:

To find the mass of the load, we can use the formula for pressure:

Pressure = Force / Area

Given that the pressure exerted by the car on the road is 130 kPa and the area of one wheel is 50 cm^2, we need to convert the area to square meters. Since 1 square meter (m^2) is equal to 10,000 square centimeters (cm^2), the area of one wheel is 50 cm^2 / 10,000 = 0.005 m^2.

Now, we can calculate the force exerted by the car on the road:

Force = Pressure x Area

Force = 130 kPa x 0.005 m^2

Force = 0.65 kN

Since the force exerted by the car is equal to the weight of the load, we can convert the force to mass using the formula:

Force = Mass x Gravity

Given that the acceleration due to gravity is approximately 9.8 m/s^2, we can rearrange the formula to solve for mass:

Mass = Force / Gravity

Mass = 0.65 kN / 9.8 m/s^2

Mass = 0.0663 metric tons

Therefore, the mass of the load is approximately 0.0663 metric tons.