The heliocentric theory explains that planets orbit the Sun at the center of our solar system. It replaced the geocentric theory, which suggested that all objects in space orbit Earth. Which evidence could have helped disprove the geocentric theory and lead to the development of the heliocentric theory?
A - The planet Earth appears to be a stationary point in space.
B - Objects in the sky, including the Sun, appear to revolve around Earth on a daily cycle.
C - The moons of the planet Jupiter are observed revolving around Jupiter
D - Earth's moon appears larger in the sky than the Sun.

Which is an example of gaining a static charge by conduction? a) rubbing a balloon against your hair. b) shuffling your shoes across a carpet. c) bringing a charged rod near an electroscope. d) touching your car on a cold day and getting a shock.

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.