Because the block is not moving, the sum of the x components of the forces acting on the block must be zero. find an expression for the sum of the x components of the forces acting on the block, using coordinate system b. express your answer in terms of some or all of the variables fn, ff, fw, and θ.

How have the competing explanations' experiments on atoms affected the development of the atomic model?

Imagine you had to physically add electrons, one at a time, to a previously neutral conductor. you add one electron very easily, but the second electron requires more work. in your initial post to the discussion, explain why this is. also, what happens to the work needed to add the third, fourth, fifth, and subsequent electrons

The image below shows numerous volcanic mountains in the pacific northwest. what is the most likely cause of the volcanic and earthquake activity in this region?