When you bring an object with one kind of charge near to the conductor or insulator, how does the surface of the conducting or insulating object tend to get charged: the same, or opposite, as the charged object?

Achemistry student needs of 40ml diethylamine for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of diethylamine is 0.7 . calculate the mass of diethylamine the student should weigh out. round your answer to significant digits.

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 •  

Name three populations commonly found in a prairie system