Question

Парашютист с парашютом общей массой m=80 кг при раскрытом парашюте спускается с постоянной скоростью. Определите силу сопротивления воздуха при этом движении. Чему равна в данном случае равнодействующая сил действующих на парашютиста

Answer 1

F = mg
F = 80 * 100 = 800H.
По-моему так решается.

Answer 2

Calculating Air Resistance Force for a Parachutist

To calculate the air resistance force acting on a parachutist with a parachute of total mass m=80 kg, we can use the formula for air resistance force:

Air resistance force (F) = 0.5 * ρ * A * C_d * v^2

Where: - ρ is the air density - A is the cross-sectional area - C_d is the drag coefficient - v is the velocity of the parachutist

Determining the Resultant Force

The resultant force acting on the parachutist can be determined by considering the forces acting on the parachutist. In this case, the forces acting on the parachutist are the gravitational force (weight) and the air resistance force.

Resultant force = Gravitational force - Air resistance force

Calculation

Given that the parachutist is descending with a constant velocity, the air resistance force is equal to the gravitational force. Therefore, the resultant force is zero.

Conclusion

In this case, the resultant force acting on the parachutist is zero. This means that the air resistance force is equal in magnitude and opposite in direction to the gravitational force, resulting in a net force of zero and a constant velocity descent.

Please let me know if you need further assistance or clarification!