Una superficie de agua se golpea con una regla cada 0,2 segundos. Si la longitud de onda de la onda que se produce
es 3,5 cm, calcula:
a. La frecuencia de la onda.
b. La velocidad de propagación de la onda.

For this case we have:

A surface of water is hit with a ruler every 0.2 seconds. If the wavelength of the wave that occurs is 3.5 cm, calculate:

a. The frequency of the wave.

b. The velocity of wave propagation.

By definition, we have that the velocity of propagation of the wave is given by:

Where:

w: is the wavelength

f: It is the frequency

On the other hand, we can find the frequency:

Thus, the velocity of propagation of the wave is:

their crystal patterns have been disrupted by stress

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.