Question

omar wants to determine if the mass of a model rocket affects how long the rocket is able to stay up in the air. to do this, he constructs three identical rockets and then fills two of the rockets with varying amounts of sand to add mass. he then launches the rockets one at a time and times how long they are able to stay airborne. what is the test variable (independent variable) in omar’s experiment? a. the masses of the model rockets b. the force with which each rocket is launched c. the materials out of which the rockets were made d. the time the rockets remain airborne

Explanation:

En un experimento, la variable independiente es aquella que se manipula para observar su efecto en otra variable. Aquí, Omar está cambiando la masa de los cohetes (llenándolos con cantidades variables de arena) para ver cómo afecta el tiempo de permanencia en el aire. Entonces, la masa de los cohetes es la variable independiente (test variable). Las otras opciones: B (fuerza de lanzamiento) no se menciona que varíe, C (materiales) son idénticos, D (tiempo de permanencia) es la variable dependiente (lo que se mide).

Answer:

A. the masses of the model rockets