The speed of sound at sea level is normally about 340 m/s. A car honks itshorn as it drives toward an observer. The frequency of the horn is 800 Hz, but theobserver hears an 860-Hz pitch. What is the velocity of the car?

In a system, when potential energy decreases, then entropy also decreases. true false

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=

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