A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

Radio signals travel at a rate of 3*10^8 meters per second. How many seconds will it take for a radio signal to travel from a satellite to the surface of the Earth if the satellite is orbiting at a height of 7.5*10^6 meters? A) 6 seconds B) 2.5*10^-2 seconds 3) 4.0*10^3 seconds D) 2.5*10^2 seconds

  • This Question is Closed
  1. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @hartnn

  2. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @Nnesha

  3. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @JoannaBlackwelder

  4. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @misty1212

  5. JoannaBlackwelder
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    distance=rate*time

  6. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so we solve for rate first? @JoannaBlackwelder

  7. JoannaBlackwelder
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    We are given rate. We are looking for time. So, solve for time.

  8. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Can u help me with that please @JoannaBlackwelder

  9. JoannaBlackwelder
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1439920734718:dw| To solve for time, we need to get it by itself.

  10. JoannaBlackwelder
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1439920766408:dw| r is currently multiplied by t, so we divide by it to get rid of it on that side. And what we do to one side of an equation, we have to do to the other side.

  11. JoannaBlackwelder
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1439920841491:dw|

  12. JoannaBlackwelder
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Does that make sense so far?

  13. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    kinda, I get confused with letters in math @JoannaBlackwelder

  14. JoannaBlackwelder
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Ok, yeah, they can be kinda tricky. Let me show you another way that doesn't use letters.

  15. JoannaBlackwelder
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Start with the distance the signal travels:|dw:1439921098416:dw|

  16. JoannaBlackwelder
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1439921144658:dw| And since the signals travel 3x10^8 meters in 1 second, we can use that ratio as a conversion factor.

  17. JoannaBlackwelder
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Since for the signals 1 second equals 3x10^8 meters of travel

  18. JoannaBlackwelder
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    And multiplying by a fraction of two things that are equal is just multiplying by 1, which doesn't change the value.

  19. JoannaBlackwelder
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1439921324634:dw| The units of m cancel since one is in the numerator and the other is in the denominator.

  20. JoannaBlackwelder
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    And we are left with a number of seconds. :-) Does that method make more sense?

  21. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    It does make more sense.. @JoannaBlackwelder

  22. JoannaBlackwelder
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    :-)

  23. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.