A 3.0 g copper penny has a positive charge of 42 microC. What fraction of its electrons has it lost?

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

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

Which body part transports oxygen removes waste materials in carries nutrients to the body as part of the circulatory system