En un libro de astronomía, Elena encuentra el siguiente espectro cósmico de una ga- laxia, tomada en dos momentos diferentes: Las diferencias que se observan en el espectro de la galaxia constituyen una evidencia:

I. de que la galaxia se está alejando.
II. de que el universo se encuentra en expansión.
III. del origen del sistema solar.

¿Cuál o cuáles de las siguientes afirmaciones es o son correctas?

A
Solo I.

B
Solo II.

C
I y II.

D
II y III.

E
I, II, III.

Ajogger accelerates from rest to 4.86 m/s in 2.43 s. a car accelerates from 20.6 to 32.7 m/s also in 2.43 s. (a) find the magnitude of the acceleration of the jogger. (b) determine the magnitude of the acceleration of the car. (c) how much further does the car travel than the jogger during the 2.43 s?

A2.00-m long piano wire with a mass per unit length of 12.0 g/m is under a tension of 8.00 kn. what is the frequency of the fundamental mode of vibration of this wire?

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?