In comparing the Ptolemaic system to the Copernican system, neither is entirely correct since Ptolemy said the earth was at the center and Copernicus said the planets had circular orbits.

How long a star lives and what it becomes at the end of its life depends primarly on what

The particles in gas are never at what

Which change increases the electric force between objects? -Two neutral objects are moved closer together. -Electrons are added to two negatively charged objects. -Two oppositely charged objects are moved farther apart.

List three kinds of electromagnetic radiation and either how it is used or how it is prevented

1. You are driving south on the 405. You are in traffic so your speed is 35 miles per hour, (35 mi/hr). Calculate your speed in m/sec. Assume that there 1.609 meters in every mile. 2. The Moon takes 27.25 days to make one revolution around the Earth.

What does a hurricane hunter do

Why is fluorine special in terms of electronegativity?

The airbag inflates and deflates quickly so

Two conducting spheres are each given a charge Q. The radius of the larger sphere is three times greater than that of the smaller sphere.

A solenoid with a ferromagnetic core is