if object A is positively charged. Object A and B attract, object B and C repel and Object C and D attract why type of charge does about B, C and D posses

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

Need people build a dam to create a reservoir that supplies water a nearby city needs. describe two ways this action will likely affect the water cycle in the local environment. (5 points) worth 20 points

In science and physics what is the standard unit of measure for speed?