Answer:
8 m/s
Explanation:
........................................................................................
1 answer:
You might be interested in
As series resistors are added, the resistance is added directly so the total resistance will be equal to
Since the power is determined as
We have there that
The power is inversely proportional to the increase in resistance, so it will tend to decrease as more resistors are added in series.
The correct answer is: C.
Question:
If you are 3.00 m from speaker A directly to your right and 3.50 m from speaker B directly to your left. What is the shortest distance d you need to walk forward to be at a point where you cannot hear the speakers?
Answer:
The shortest distance d you need to walk forward to be at a point where you cannot hear the speakers is 5.625 m
Explanation:
Shortest distance is given by
For constructive interference of wave, we have
= 2nλ/2
For destructive interference of wave, we have
= (2n+1)λ/2
That is the difference in the number of wavelength between constructive and destructive interference is λ/2
We note that our positioning is 3.0 m from the first speaker and 3.5 m from the second, Which is of the form 2n and 2n + 1
Therefore when we walk forward away from the two speakers, we cannot hear the speakers at
Δr = λ/2 = r - r
Which is the distance between the points where we have constructive and destructive interference or where there is destructive interference between the waves
Where:
r = Distance from speaker A and
r = Distance from speaker B
λ/2 = (344 m/s /688 Hz)/2
= 1/4
For
λ/2 = r - r
we have
√(3.5² +d²) - √(3²+d²) = 1/4
∴ d = 5.625 m
