Question

1 Найти массу мальчика, если стоя на коньках, длина лезвия которого 30 см ширина 8 мм он оказывает давление 100 кПа

Answer 1

Ответ: 48кг

Объяснение:

Дано:

l=30cм=0,3м

а=8мм=0,008м

Р=100кПа=100000Па

--------------------------------

m-?

Р=F/S=mg/(2la)

Отсюда m=2Рla/g=2*100000*0,3*0,008/10=48кг

Answer 2

Calculating the Mass of the Boy on Ice Skates

To calculate the mass of the boy standing on ice skates, we can use the formula for pressure:

Pressure = Force / Area

Given: - Pressure = 100 kPa - Length of the blade = 30 cm = 0.3 m - Width of the blade = 8 mm = 0.008 m

We can calculate the force exerted by the boy on the ice through the blades using the formula:

Force = Pressure × Area

The area of the blade can be calculated as the product of its length and width.

Calculation

First, let's calculate the area of the blade: - Area = Length × Width - Area = 0.3 m × 0.008 m - Area = 0.0024 m²

Now, we can calculate the force exerted by the boy on the ice: - Force = 100 kPa × 0.0024 m² - Force = 0.24 kN

Converting Force to Mass

To convert the force to mass, we can use the formula:

Force = Mass × Acceleration

In this case, the acceleration due to gravity is approximately 9.81 m/s². Therefore, we can calculate the mass of the boy:

Mass = Force / Acceleration

Let's calculate the mass using this formula.

Result

The mass of the boy standing on the ice skates is approximately: - Mass = 0.24 kN / 9.81 m/s² - Mass ≈ 24.45 kg

So, the mass of the boy is approximately 24.45 kilograms.