Four objects are situated along the y axis as follows: a 2.00kg object is at 3.00m, a 3.00kg object is at 2.50m, a 2.50kg object is at the origin and a 4.00kg object is at -0. 500 m. Where is the center of mass of these objects?

=force × distance a. work b. velocity c. pressure d. momentum

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=

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