To hear a train approaching from far away, why is it more convenient to put the ear to the track?

The differences between  a compression wave and a transverse wave?

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?

What are the similarities & differences between a thermistor and a light dependent resistor in physics?