g A spaceship carrying a light clock moves at a speed of 0.90c relative to an observer on Earth. If the clock on the ship advances by 2.00 s as measured by the space travelers aboard the ship, how long did that advance take as measured by the observer on Earth

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=