A tuning fork starts to vibrate when a certain note is played on the piano. this is an example of? A. resonance
B. reflection
C. refraction
D. diffraction

What are the applications of electromagnetic waves

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.