Question

Маса людини 70 кг. Площа черевика 450 см². Який тиск створює людина на підлогу? (Людина стоїть на поверхні на двох ногах) Відповідь округліть до цілих Па.​

Answer 1

Дано:

m=70 кг

S1=450 см2=0,045 м2

n=2

g≈9,8 Н/кг

p-?

Розв'язання:

S=S1×n=0,045×2=0,09 м2

F=mg=70×9,8=686 Н

p=F/S=686/0,09≈7622 Па

Ответ:p=7622 Па.

Answer 2

To calculate the pressure exerted by a person on the floor, we need to divide the force exerted by the person by the area of contact between the person's feet and the floor. In this case, the force exerted by the person is equal to their weight, which is given as 70 kg. The area of contact between the person's feet and the floor is given as 450 cm².

To calculate the pressure, we can use the formula:

Pressure = Force / Area

First, let's convert the weight from kilograms to newtons. The weight of an object can be calculated by multiplying its mass by the acceleration due to gravity, which is approximately 9.8 m/s².

Weight = Mass × Acceleration due to gravity

Weight = 70 kg × 9.8 m/s²

Calculating the weight:

Weight = 686 N

Now, let's convert the area from square centimeters to square meters. Since 1 m² is equal to 10,000 cm², we can divide the given area by 10,000 to convert it to square meters.

Area = 450 cm² ÷ 10,000

Calculating the area:

Area = 0.045 m²

Now, we can calculate the pressure by dividing the weight by the area:

Pressure = 686 N ÷ 0.045 m²

Calculating the pressure:

Pressure ≈ 15222 Pa

Therefore, the pressure exerted by the person on the floor is approximately 15222 Pa.