A strongman in a competition must throw a heavy cement sphere as far as he can up into the air. How high must he throw a 65.0kg sphere to give it 2,000J of potential energy?

close lines strong magnet less close weaker

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.