If two waves pass a point every second, what is the frequency of the waves?
a. one wave per second
b. two waves per second
c. half a wave per second
d. one wave per two seconds

T = 1/f

So frequency is 1/T (period)

So if every second two waves pass through a given point then I believe the frequency would be 2Hz which is 2 waves every second, or 2 waves per second.

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)

current flows in a wire