The time described above is known as the waves Period.
The time which it takes for a particle to complete one full cycle is known as the period. Period is normally measured in seconds. Frequency on the other hand is the number of cycles which are completed in a given period of time e.g a second. periodic time T is given by reciprocal of frequency (1/f).
Force = mass x acceleration
15 = mass x 4
Mass = 15/4
Mass = 3.75 Kg
Can you write this better and from my info of what i know i know that one way is the trenches in the ocean like marianas trench <span />
Answer:
Total internal reflection is going on. The refractive index of water is about 1.3, so sin 90/sin r=1/sinr=1.3. So the fish can only see objects outside the water within about 50 degrees of the vertical
