Question

supplies are dropped from an airplane on to a remote island. a parachute is used to reduce the impact when the supplies strike the ground. which of these is most likely to improve the design of a parachute?

reduce the size of the parachute to reduce drag.

reduce the weight of the parachute to reduce drag.

use two layers to make the parachute to increase drag.

increase the surface area of the parachute to increase drag.

pregunta 4

1 puntos

in a car accident, the goal is to minimize the force of impact during the crash. which of these would reduce the force of impact?

increasing the mass of the car in the accident.

increasing the time over which the impact occurs.

increasing the speed that the car is going before the accident.

increasing the speed that the car is going after the accident.

Explanation:

Para reducir el impacto cuando las provisiones golpean el suelo, se debe aumentar la resistencia al aire (drag). Aumentar el área de superficie de un paracaídas aumenta el drag, lo que reduce la velocidad de caída y, por lo tanto, el impacto.

En un accidente de coche, la fuerza de impacto se reduce al aumentar el tiempo de impacto. Esto se debe a la ecuación de impulso - fuerza (\(F=\frac{\Delta p}{\Delta t}\)), donde \(F\) es la fuerza, \(\Delta p\) es el cambio de momento y \(\Delta t\) es el tiempo. Aumentar \(\Delta t\) reduce \(F\).

Answer:

Para la pregunta de los paracaídas: "Increase the surface area of the parachute to increase drag."

Para la pregunta del accidente de coche: "Increasing the time over which the impact occurs."