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Nadya [2.5K]
3 years ago
6

Sir Isaac Newton found that white light contained every color, so objects _____ the colors they are not and _____ the color they

are.
A. mirror / mimic
B. accept / reject
C. accelerate / repel
D. absorb / reflect
Physics
2 answers:
crimeas [40]3 years ago
8 0
The answer is D. Objects will absorb colors they are not but reflect the color they are
yaroslaw [1]3 years ago
7 0
Your answer is letter D
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A violin string is 45.0 cm long and has a mass of 0.242 g. When tightened on the neck of the violin, the distance between the pi
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Answer:

The tension is 75.22 Newtons

Explanation:

The velocity of a wave on a rope is:

v=\sqrt{\frac{TL}{M}} (1)

With T the tension, L the length of the string and M its mass.

Another more general expression for the velocity of a wave is the product of the wavelength (λ) and the frequency (f) of the wave:

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We can equate expression (1) and (2):

\sqrt{\frac{TL}{M}}=\lambda f

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T= \frac{M(\lambda f)^2}{L} (3)

For this expression we already know M, f, and L. And indirectly we already know λ too. On a string fixed at its extremes we have standing waves ant the equation of the wavelength in function the number of the harmonic N_{harmonic} is:

\lambda_{harmonic}=\frac{2l}{N_{harmonic}}

It's is important to note that in our case L the length of the string is different from l the distance between the pin and fret to produce a Concert A, so for the first harmonic:

\lambda_{1}=\frac{2(0.425m)}{1}=0.85 m

We can now find T on (3) using all the values we have:

T= \frac{2.42\times10^{-3}(0.85* 440)^2}{0.45}

T=75.22 N

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Explanation:

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