Hello! Let's see what I can do! ^_^
12) Now, the method I used was tedious, but it worked (so if there's an easier way, hit us up!)
All these satellites are orbiting the earth, and so they all should have the same ratio with Kepler's law; ie:
From here, I used the values given but left one as "unknown" to see if it fell out. Firstly, I used A and B:
^3}{(5.35\times10^3)^2}= \frac{r^3}{(5.53\times10^3)^2} )
Which is close enough!, so A and B are right!
Now we compare one of the ones we know are right (We'll go A) with C, to see if that is right.
^3}{(5.35\times10^3)^2}= \frac{r^3}{(12\times60\times60)^2})
Remember to keep units the same (convert hours to seconds)
This does not equal the value given!! So the answer is C (If you were to check D, you'd see that it would work too
)
13) Now, a rule of physics is that light is constant for all inertial frames of references, so when the light is travelling towards earth, the earth will observe it being 3x10^8, so C AND D are wrong. So from here, it seems like a simple velocity = distance/time question.
So now we need to convert to Years
This is lower than the given value, So, I'm pretty sure it is then A
Also, I'll come back to your next 2 question in a couple of hours (assuming no one else goes for it
So I'll get to them soon!
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