John sets the record for high diving, by diving off a 178 m high cliff into the ocean. His friend had to push him off because he was scared. How much time will pass between the time he jumps and the time his friend hears his splash? (temp = 25 C)

Aheavy boy and a lightweight girl are balanced on a massless seesaw. the boy moves backward, increasing his distance from the pivot point. what happens to the seesaw? it is impossible to predict without knowing additional information. the side the boy is sitting on will tilt downward. the side the girl is sitting on will tilt downward. nothing; the seesaw will remain balanced.