A boy weighing 45 kg stands on skis. Each ski is 1.5 m long and 10 cm wide.

A boy weighing 45 kg stands on skis. Each ski is 1.5 m long and 10 cm wide. How much pressure does the boy put on the snow?

We calculate the pressure on the snow using the formula:

P = F / S, where F is the force of pressure of the boy’s mass on the snow (F = m * g, where m is the boy’s mass (m = 45 kg), g is the acceleration due to gravity (let’s take g = 10 m / s²)), S is the total area of the skis (S = 2 * a * b, where a is the length of the ski (a = 1.5 m), b is the width of the ski (b = 10 cm = 0.1 m)).

Let’s calculate the pressure that the boy exerts:

P = F / S = m * g / (2 * a * b) = 45 * 10 / (2 * 1.5 * 0.1) = 450 / 0.3 = 1500 Pa = 1.5 kPa.

Answer: The pressure is 1.5 kPa.