Answer:
correct answer is a
Explanation:
For this exercise we must add the two oscillations
y_total = y₁ + y₂
y_total = 5 sin wt + 5 cos wt
y _total = 5 (sin t wt + cos wt)
the sine and cosine functions are related
cos (a +90) = cos a cos 90 - sin 90 sin a = - sin a
let's call
a= wt
let's substitute
y_total = 5 (-cos (wt +90) + cos wt)
the cosine function has the same value for +θ and -θ
cos θ = cos (-θ)
Thus
y_total = 0
correct answer is a
