An automobile, the speed of which is increasing at a rate of 0.6ms', travels along a circular road of radius 20m. when the instantaneous speed of the automobile is 4ms-1, find(a)the tangential acceleration components and (b)the magnitude and direction of the total acceleration.

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=