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.

Why does the moon have so many craters compared to the earth?

How does light travel? A. Light only travels in a vacuum and travels faster when the sound source is moving. B. Light only travels in a medium and light travels faster when a sound source is stationary. C.

Which of these statements best explains why the difference between summer and winter temperatures is greatet in Russia thanin FL

A block of mass 9.5kg rests on a slope an angle of 23.0∘ relative to the horizontal. What is the size of the contact force normal to the slope, in Newtons? Use a gravitational acceleration value of g = 9.8m/s^2.

Iron can rust when it is exposed to oxygen. What method could be used to prevent iron from rusting?

How are energy and speed related

11. Which of the following best explains velocity? A. The direction of an object in motion B. Only the change of direction of an object in motion C. The speed and direction of an object in motion D. The speed of an object in motion

Using 6400 km as the radius of Earth, calculate how high above Earth's surface you would have to be in order to weigh 1/16th of your current weight. Show all work leading to your answer OR describe your solution using 3 - 4 complete sentences.

Which of these could occur if a switch is closed? A. A light bulb will light up. B. A hair dryer will turn off. C. A computer will shut down. D. B and C

When you throw a ball the work you do to accelerate it equals the kinetic energy the ball gains?