A fisherman fishing from a pier observes that the float on his line bbobs up and down, taking 2.4s to move from its highest point to its lowest point. he also estaimtes that the distance between adjacent wave crests is 48m. What is the speed of the waves going past the pier?

Explanation:

The problem is based on speed of transverse waves formed on the surface of water. Time to travel from crest to next trough is 2.4s . So time to travel from crest to next crest will be two times 2.4 s . That is 4.8 s.  

Time to travel distance between two consecutive crest = 4.8s

distance between two consecutive crest is 48 m ( given )

velocity of wave = distance / time

= 48 / 4.8

= 10 m /s .

velocity of wave = 10 m /s.

the results is a decrease in air temperature with an increase of altitude.

explanation:

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y