En la base del funcionamiento del motor cohete está: a) Una mezcla explosiva. b) Un principio físico.
c) La atracción gravitatoria d) Un deseo por viajar.
e) Newton y su prestigio.
6. La preparación de un motor cohete incluye:
a) Dos depósitos que permiten la mezcla explosiva.
b) La ley de Isaac Newton de acción y reacción.
c) Un motor desplazado en sentido contrario a los gases.
d) Considerar la gravedad gravitatoria del cosmos.
e) Un recinto hermético cubierto de mucho combustible.

Which of the following ideas did greek philosopher democritus contribute to the atomic theory? a. each object is made up of one atom, which varies in size from very small to very large. b. matter is composed of only one kind of particle, which can be easily destroyed. c. every element has a specific type of atom, which remains the same size in all forms of matter. d. all matter is composed of small particles, which combine to make larger objects.

Classify each action depending on whether it will meet or fail to meet the goals of the organization. a group of students form a healthy earth club at their school. their goal is to limit their school’s impact on human-led climate change. they brainstormed a list of actions they can take to meet this goal.

The smokey mountains have over 2,100 miles of rushing mountain streams and rivers that flow through the park. in each mile lives a diverse community of native fish, amphibians, insects, and larvae, some of which are found only in the southern appalachians. park managers and scientific researchers test many factors such as fish populations, the watersheds and water tests to determine a) too many lizards are present b) the water quality of the stream c) rainwater is running into local streams d) if visitors to the park are overstaying their welcome