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KatRina [158]
3 years ago
6

ns:Select the correct answer. In a video game, a flying coconut moves at a constant velocity of 20 meters/second. The coconut hi

ts an obstacle and moves in the opposite direction with a constant velocity of 10 meters/second. What’s the change in velocity of the coconut?
Physics
1 answer:
Len [333]3 years ago
5 0
You would need to use the equation a= (v-u)÷t
You need to substitute in the correct numbers.
a= (10-20)÷1
Your answer is -10m/s^2
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If the angular magnification of an astronomical telescope is 42 and the diameter of the objective is 72 mm, what is the minimum
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Explanation:

The velocity of a wave on a rope is:

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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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Solving for T

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

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

T=75.22 N

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