D. Un chico se tira del trampolín de una piscina. El sonido de la zambullida es escuchado por una chica que toma sol en el borde de la piscina, a 40 metros del lugar donde cayó el chico. También es oído por el guardavida, mientras está sumergido en el agua a 40 metros de donde cayó el chico. Una medición cuidadosa mostraría que el guardavida escucha la zambullida una fracción de segundo antes que la chica ¿Cómo lo explicarías?

What is the length x of the side of the triangle below? (hint: use the cosine function)

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )