A certain machine can output 50 joules when 100 joules of energy are input. If the amount of friction experienced by the machine is reduced, which of the following is most likely its output?
A. 0j
B. 25j
C. 50j
D. 75j

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=

The velocity of a car traveling in a straight line increases from 0 meters/second to 30meters/second in 8 seconds. what is the average acceleration of the car?

How can a cyclist's acceleration change even if its velocity remains constant?