Question

На лыжах стоит спортсмен,масса которого вместе с лыжами равна 80 кг. Длина каждой лыжи 2 м,ширина-10 см.Найти давление лыж на снег.

Answer 1

F=m•g=80кг•10Н/кг=800Н
S=2•2•0,1=0,4m в кв
р=F/S=800/0,4=2000Па

Answer 2

Calculating Pressure of Skis on Snow

To calculate the pressure of the skis on the snow, we can use the formula for pressure, which is pressure = force / area. In this case, the force is the weight of the skier and skis, and the area is the surface area of the skis in contact with the snow.

Given: - The total mass of the skier and skis is 80 kg. - The length of each ski is 2 m. - The width of each ski is 10 cm.

First, let's calculate the total force exerted by the skier and skis on the snow.

The weight of the skier and skis can be calculated using the formula weight = mass * acceleration due to gravity. The acceleration due to gravity is approximately 9.81 m/s^2.

Calculating the Weight of the Skier and Skis: The weight of the skier and skis = 80 kg * 9.81 m/s^2 = 784.8 N.

Now, we need to calculate the area of the skis in contact with the snow. Since the skis are rectangular, the area can be calculated using the formula area = length * width.

Calculating the Area of Each Ski: The area of each ski = 2 m * 0.10 m = 0.20 m^2.

Since there are two skis, the total area in contact with the snow is 0.20 m^2 * 2 = 0.40 m^2.

Now, we can calculate the pressure exerted by the skier and skis on the snow using the formula pressure = force / area.

Calculating the Pressure: Pressure = 784.8 N / 0.40 m^2 = 1962 N/m^2.

Therefore, the pressure of the skis on the snow is 1962 N/m^2.