Question

Потенциальная энергия шарика, поднятого относительно поверхности Земли, равна 50 Дж. В момент падения на поверхность Земли его кинетическая энергия равна 45 Дж.Найдите работу силы сопротивления воздуха. Модуль ускорения свободного падения принять равным 10м/с

Answer 1

Calculation of Work Done by Air Resistance

To find the work done by the force of air resistance, we need to calculate the difference between the initial potential energy and the final kinetic energy of the ball.

The potential energy of the ball when it is lifted above the surface of the Earth is given as 50 J. The kinetic energy of the ball when it falls to the surface of the Earth is given as 45 J.

The work done by the force of air resistance can be calculated using the equation:

Work = Change in Energy

In this case, the change in energy is the difference between the initial potential energy and the final kinetic energy:

Work = Potential Energy - Kinetic Energy

Substituting the given values:

Work = 50 J - 45 J = 5 J

Therefore, the work done by the force of air resistance is 5 J.

Calculation of Acceleration Due to Gravity

The acceleration due to gravity is given as 10 m/s².

Conclusion

The work done by the force of air resistance is 5 J, and the acceleration due to gravity is 10 m/s².