If you take clothes directly out of the dryer, they sometimes have built up an electric charge. What could you do in order to figure out if that charge is positive or negative?

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

How can you increase the strength of an electromagnet?