Which of the follow is not an example of a force which acts at a distance? a. a pair of magnets repel each other
b. a charged brush attracts a stream of water
c. a bat hits a baseball
d. a comet orbits the sun

If the new moon happens on january 15th, what shape will it be on february 6th?

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=

Which component of the earth’s atmosphere is decreased due to photosynthesis?