An object on the surface of the earth weighs 90 lb. At two earth radii above the surface, It will welgh:

Physics

1 answer:

vredina [299]2 years ago

4 0

I have no explanation, but saw this pop up on a test paper and the answe was 10lb

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The table below shows the right ascensions of two stars at a location.

noname [10]

Star 1 - 4 hours right ascension
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star 1 will rise 1 hour before star 2

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What is the angle of the 2nd order bright fringe produced by two slits that are 8.25x10-5m apart if the wavelength of the incide

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In order to calculate the angle, we can use the formula below for a constructive interference (the interference is constructive because the fringe is bright):

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Where d is the distance between the slits, m is the order of the interference and lambda is the wavelength.

So, using d = 8.25 * 10^-5, m = 2 and lambda = 4.5 * 10^-7, we have:

$\begin{gathered} 8.25\cdot10^{-5}\cdot\sin\theta=2\cdot4.5\cdot10^{-7}\\ \\ \sin\theta=\frac{9\cdot10^{-7}}{8.25\cdot10^{-5}}\\ \\ \sin\theta=1.091\cdot10^{-2}\\ \\ \theta=0.625° \end{gathered}$

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1 year ago

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kogti [31]

Answer:

C. a full outer shell of valence electrons.

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The noble gases has a full outer shell so they don't have to react with other elements to gain or loose electrons (to have a full outer shell and be stable).

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