Acar is traveling at 20 meters/second and is brought to rest by applying brakes over a period of 4 seconds what is its average acceleration over this time interval?

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two

What is the role of lenses in microscopy?

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=