21. 2) Select the best answer. What did Greek philosophers Isaac Newton, and others commonly use to explain their observations? journals math hand gestures interpreters

8> What is the random capture theory? Which theory best explains how our solar system was created?

Consider the following force: A fridge magnet is pulling on a paper clip. According to Newton's third law what other force must be happening? The paper clip is pushing on the fridge magnet. The paper clip is pulling on the fridge magnet.

Which one of the following actions will increase the current ratio, all else constant? Assume the current ratio is greater than 1.0

For Newton's third law the action and reaction forces are equal in magnitude and opposite in direction. A True B False

Why is a solid less compressible than a gas? Gases have more volume Solids are made of metals Solid particles are tightly packed Solids are heavier

11. ¿Qué es un campo gravitacional? A) Una región donde se experimenta una fuerza eléctrica. B) Una región donde se experimenta una fuerza magnética. C) Una región donde se experimenta una fuerza gravitacional D) Una región sin ninguna fuerza.

Which types of electromagnetic waves are slower than visible light? ultraviolet gamma rays radio waves microwaves

Which form of electromagnetic radiation carries the most energy? X-rays Infrared Radio waves Gamma rays Microwaves

11. In Snell's Law the ratio of the indices is related to the inverse ratio of the __ of the angles. square cosine tangent natural log sine

This path increment for an apple corresponds to negative work done by gravity: $\Delta y=+0.25m$ $\Delta y=-0.25m$ $\Delta y=0.00m$