Use this picture to explain that an electrically charged object can attract an uncharged object without any contact. Your answer should be at least three sentences long.

How will the system respond to a temperature increase?

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class

Find an expression for the electric field e⃗ at the center of the semicircle. hint: a small piece of arc length δs spans a small angle δθ=δs /r, where r is the radius. express your answer in terms of the variables q, l, unit vectors i^, j^, and appropriate constants.