Question

В ботинках площадь подошв которых 300см2,ученик оказывает на пол давление,равное 15 кПа.Какое давление на лед будет оказывать этот ученик, стоя на коньках,если площадь лезвия одного конька равна 4см2

Answer 1

 300см2/2*4 см2=37,5. Значит, площадь настолько уменьшился. Это значит, что давление во столько раз должен увеличиться. 15000 Па*37,5=562500 Па=562,5 кПа.

Answer 2

Calculation of Pressure on Ice

To calculate the pressure that the student will exert on the ice while standing on skates, we can use the formula for pressure:

Pressure (P) = Force (F) / Area (A)

Given that the student exerts a pressure of 15 kPa on the floor with an area of 300 cm², we can calculate the force exerted by the student using the formula:

Force (F) = Pressure (P) × Area (A)

Substituting the given values, we have:

Force (F) = 15 kPa × 300 cm²

Now, we need to calculate the pressure that the student will exert on the ice. The area of one skate blade is given as 4 cm². Let's denote the pressure on the ice as P_ice.

Using the same formula, we can calculate P_ice:

Pressure on Ice (P_ice) = Force (F) / Area of One Skate Blade (A_ice)

Substituting the values we have:

Pressure on Ice (P_ice) = (15 kPa × 300 cm²) / 4 cm²

Now, let's calculate the value:

Pressure on Ice (P_ice) = (15 kPa × 300 cm²) / 4 cm² = 1125 kPa

Therefore, the student will exert a pressure of 1125 kPa on the ice while standing on skates.