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.

A wave of infrared light has a speed of 6 m/s and a wavelength of 12 m. what is the frequency of this wave?

What are some examples of irreversible processes in nature?

How do i do this? Draw a Punnett square in your assignment worksheet that shows the results of a cross between a homozygous red bull (RR) and a heterozygous red cow (Rr). Be certain to title your Punnett square and indicate each parent.

How can friction be harmful to a car engine?

How do brakes change physical forces

At the beach, describe where or when you would see wave fronts. How are wave fronts useful to surfers?

How would the moon appear from earth if the moon did not rotate?

Block B has mass 4.00 kg and sits at rest on a horizontal, frictionless surface. Block A has mass 2.00 kg and sits at rest on top of block B. The coefficient of static friction between the two blocks is 0.400.

T=2π√ (l/g) is dimensionally correct

A penny falls from a windowsill which is 25.0 m above the sidewalk. How much time does a passerby on the sidewalk below have to move out of the way before the penny hits the ground?