At room temperature (68°F) a steel sphere (ball) with a diameter of 25cm rests on an aluminum ring of dimeter 24.75cm. Which one do I heat in order to have the ball pass through the ring? What temperature will it need to be?

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

the answer to this is proletariats.

hope this : )