The sider block moves with a velocity of r., 1.5 m/s and an acceleratim of α. 0.9 m/s 13 m/s. determine the npvlar sceternien of rod at and the acceterasion of a at the instant shown -15 ms 与“09 m/? at a gives instant, the gear has the srgalar mocon shows, duteheactions of points a and 8 on the link and the inksargular accelerarion at this itant

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=