Question

Камень массой 2 кг брошен вертикально вверх со скоростью 10 м/с и упал в том же месте со скоростью 8 м/с работа сил сопративления воздуха равна

Answer 1

По теореме об изменении кинетической энергии работа равнодействующей силы равна изменению кинетической энергии Aс= Eк-Eко= m/2(V^2-Vo^2)= 0,2*(64-100)/2=-3,6 Дж работа отрицательная так как сила направлена против движения

Answer 2

Calculating Work Done by Air Resistance

To calculate the work done by air resistance, we can use the work-energy principle, which states that the work done on an object is equal to the change in its kinetic energy. In this case, the work done by air resistance can be calculated as the difference between the initial kinetic energy and the final kinetic energy of the stone.

Given: - Mass of the stone, m = 2 kg - Initial velocity, v0 = 10 m/s - Final velocity, v = 8 m/s

The work done by air resistance can be calculated using the formula: Work = Change in kinetic energy = (1/2) * m * (v0^2 - v^2)

Substituting the given values: Work = (1/2) * 2 * (10^2 - 8^2) Work = (1/2) * 2 * (100 - 64) Work = (1/2) * 2 * 36 Work = 36 J

Therefore, the work done by air resistance is 36 Joules.