What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal
tube for 40 degress c water to
flow through it at an average speed of 4.0 m/s?

magnitude and direction

the answer for apex is the lowest

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.