A toy helicopter takes off and moves 6 m up and then 1 m back down. What is the displacement of the helicopter?
A. 7 m
5 m up
C. 6 m
D. 1 m down

to treat tumors in the body

measure their densities same density, same sub

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.