Arailway engine i mass 6000kg travelling at 4m/s collided with and coupled to a truck of mass 2000kg that was in totally not moving
a.) calculate the momentum before the collision of the engine
b.) show that the engine and the truck moved at a velocity of 3m/s after the collision

second mirror gathers light from a faraway object and reflects it to another mirror. - a.

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.