Question

Кошка массой 5 кг сидит на стуле массой 3 кг.у стула 4 ножки.площадь каждой ножки 4 см².найти давление кошки вместе со стулом на пол

Answer 1

4=0.0004
0.0004*4=0.0016м2
(5+3)*10=80H
80/0.0016=50kП

Answer 2

5+3=8 кг общей массы на все ножки. 
4*4=16 см² общее площадь соприкосновения стула с полом
Формула для давления твёрдых тел P=F/S
F=mg   g=10
8*10=80F
P=80/16=5 Па 

Answer 3

Calculation of Pressure

To find the pressure exerted by the cat and the chair on the floor, we need to calculate the total weight and the total area of contact.

Given: - Mass of the cat = 5 kg - Mass of the chair = 3 kg - Number of legs on the chair = 4 - Area of each leg = 4 cm²

Calculation of Total Weight

The total weight is the sum of the weight of the cat and the weight of the chair.

Weight of the cat = mass of the cat × acceleration due to gravity Weight of the chair = mass of the chair × acceleration due to gravity

The acceleration due to gravity is approximately 9.8 m/s².

Weight of the cat = 5 kg × 9.8 m/s² = 49 N Weight of the chair = 3 kg × 9.8 m/s² = 29.4 N

Calculation of Total Area

The total area is the sum of the areas of all the legs of the chair.

Area of each leg = 4 cm² Number of legs = 4

Total area = area of each leg × number of legs = 4 cm² × 4 = 16 cm²

Calculation of Pressure

Pressure is defined as force divided by area.

Total force = weight of the cat + weight of the chair = 49 N + 29.4 N = 78.4 N

Pressure = total force / total area

Converting the area from cm² to m²: Total area = 16 cm² = 16 cm² × (1 m / 100 cm)² = 0.0016 m²

Pressure = 78.4 N / 0.0016 m² = 49,000 Pa

Therefore, the pressure exerted by the cat and the chair on the floor is 49,000 Pa.

Please note that the above calculation assumes that the weight of the cat and the chair is evenly distributed among the legs of the chair.