Answer:
energy I think I'm not sure of the answer.
The third one sliding friction
Explanation:
D.Power has a time component while energy does not. This is because power is the RATE at which work is performed.
Beat frequency, fb = |f2-f1|
That is, beat frequency is the absolute difference between two frequencies. Is is as a results of destructive and constructive inferences.
Therefore, in this case:
fb = 203 - 199 = 4 Hz