Physics explanation how to do sin theta and cos theta on incline plane.

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? express your answer in terms of some or all of the variables s, q1, q2 and k =14ï€ïµ0. if your answer is difficult to enter, consider simplifying it, as it can be made relatively simple with some work.

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply