10.25 Una patinadora artística repliega sus brazos durante un giro final. Como se conserva el momento angular, su veloci-
dad angular aumentará. ¿Se conserva su energía cinética de
rotación durante este proceso? Si no, ¿de dónde viene la ener-
gía extra o hacia dónde va?

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=

Current from a charged capacitor lights a bulb. as time goes on the brightness of the

If there's a small amount of friction between two surfaces, the result could be select all that applya. no movement b. heatc. a little bit of movementd. sliding around