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Compassionate

  • 2 years ago

Let's see how smart OpenStudy is. The light from the sun travels 187,000mps It hits earth in 8min. How far away is the earth form the sun given this information? How long would it take a Sakura Blossom falling at 5cm/sec to reach Earth from the Sun? Find the force being exerted by the light upon the Earth and how far the earth moves each year by the implications of light imposed upon Earth. Given the earth weighs: 5.972E24 kg How smart is OpenStudy? Lets see.

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  1. AravindG
    • 2 years ago
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    \[Speed=\dfrac{distance}{time}\]

  2. AravindG
    • 2 years ago
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    \[\LARGE \text{speed of light} =3 \times 10^8\] approx

  3. AravindG
    • 2 years ago
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    so I guess you can do part 1

  4. Compassionate
    • 2 years ago
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    >How long would it take a Sakura Blossom falling at 5cm/sec to reach Earth from the Sun?

  5. AravindG
    • 2 years ago
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    in part 2 you are given the speed and distance ,find time

  6. AravindG
    • 2 years ago
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    distance is got from part 1 :)

  7. Compassionate
    • 2 years ago
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    Correct. But you're not given the time at 5cm/s

  8. AravindG
    • 2 years ago
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    Part 2 asks for the time !!

  9. Compassionate
    • 2 years ago
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    There is no part 1 and 2. This is all one.

  10. Compassionate
    • 2 years ago
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    You want to find the distance given the speed and time.

  11. ParthKohli
    • 2 years ago
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    \[\rm force = mass \times acceleration\]

  12. PeterPan
    • 2 years ago
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    Let's see how smart OpenStudy is. --Part 1-- The light from the sun travels 187,000mps It hits earth in 8min. How far away is the earth form the sun given this information? --END Part 1-- --Part 2-- How long would it take a Sakura Blossom falling at 5cm/sec to reach Earth from the Sun? --End Part 2-- Find the force being exerted by the light upon the Earth and how far the earth moves each year by the implications of light imposed upon Earth. Given the earth weighs: 5.972E24 kg I'm sure this was what Aravind meant when he said part 1 and part 2

  13. ParthKohli
    • 2 years ago
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    Since the mass of light is \(0\), we can just say that light exerts a force of \(0N\)? I don't know, I am not so good at Physics. I think light does exert some force.

  14. AravindG
    • 2 years ago
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    @PeterPan thanks .Its always a good idea to break a question into parts :)

  15. Compassionate
    • 2 years ago
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    In fact, light does move the earth every year. I am asking you to find out given little information.

  16. Compassionate
    • 2 years ago
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    True, light has no stationary mass, but it has a force. Light can burn things, and that's a form of force.

  17. AravindG
    • 2 years ago
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    Light (as in photons) carries momentum. Any change in that momentum (such as absorption or reflection), will impart a force. So yes, it can exert a force. @ParthKohli

  18. Compassionate
    • 2 years ago
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    So, the question stands, how much force is exerted upon the earth each year and as a result moves it back.

  19. AravindG
    • 2 years ago
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    maybe @JamesJ can enlighten us on this

  20. AravindG
    • 2 years ago
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    what I can only predict is that the force may be around 1 newton or less,

  21. AravindG
    • 2 years ago
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    @Compassionate do you have the answer with you ?

  22. Compassionate
    • 2 years ago
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    I do.

  23. JamesJ
    • 2 years ago
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    Sure, the sun does exert a radiation pressure on the earth of around 4 microPascals, nearly all of it absorbed. So the force isn't quite as low as 1 Newton, but the acceleration due to it is tiny.

  24. AravindG
    • 2 years ago
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    I think he needs a numerical answer James

  25. JamesJ
    • 2 years ago
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    I'm not going to do the calculations here myself. I'll ask the questioner what they know about radiation pressure, and what relations they have that can help. I'm happy to be a thought partner. But not right now; I'm going to bed.

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