Which object is in static equilibrium?
-a rolling ball that has a net force acting on it
-a cruising car that has no net force acting on it
-a book that has no net force acting on it and is sitting on a table
-a vase that has a net force acting on it and is sitting on a shelf

i would think form in reponse to tensional forces

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

less than one you can't create energy

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.