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 is it that silver heats quicker than aluminum?

In the winter sport of curling, players give a 20 kg stone a push across a sheet of ice. the stone moves approximately 40 m before coming to rest.

What is the most important safety rule in cycling?

A fixed amount of gas at 25.0°c occupies a volume of 10.0 l when the pressure is 667 torr. use boyle's law to calculate the pressure (torr) when the volume is reduced to 7.88 l at a constant temperature of 25.0°c.

What is the name for a compound formed with covalent bonds? O A. metallic ionic bond O B. molecule O c. anion O D. valence electron shell

A student is trying to calculate the density of a ball. She already knows the mass, but she needs to determine the volume as well. Which of the following formulas can be used to calculate the volume of the ball?

Is there such a thing as real time weather radar? why not?

Luke and Carrie are driving down a straight section of the interstate at 70 mph in Luke's new convertible. Carrie is drinking a soda in the passenger seat.

A force produces power p by doing work w in a time t. what power will be produced by a force that does six times as much work in half as much time?

A batter hits a baseball with a bat. The bat exerts a force on the ball. Does the ball exert a force on the bat?