If the grating constant is 400 lines/mm, what is the spacing between the lines? a. 1/400 b. 1/40 cm c. 1/400 mm d. 400 mm e. 40 cm

Astone is dropped from a cliff and falls 9.44 meters. what is the speed of the stone when it reaches the ground? a. 13.6 m/sec b. 1.39 m/sec c. 185 m/sec d. 9.80 m/sec

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) 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=