Which of the following is NOT a defining feature of mountains? Significant height above sea level
Prominence (the fact or condition of standing out from something by physically projecting or being particularly noticeable.)
Steepness
Cold weather

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

What are similarities and differences between refraction, reflection, diffraction and absorption?

Which atomic model was proposed as a result of j. j. thomson’s work?