1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Dynamics Problem? - reason for the cases described

  1. Dec 13, 2014 #1
    1. The problem statement, all variables and given/known data
    pic.png

    2. Relevant equations


    3. The attempt at a solution
    i cant figure out the reasons for the statements. could you explain, along with th e physics involved.
    also, (a) and b(i). you are welcome to explain the numerical parts too.
     
  2. jcsd
  3. Dec 13, 2014 #2

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Apparently, it's some sort of HW problem or exam. Where's the rest of it?
     
  4. Dec 13, 2014 #3
    it's an exam question from very old paper - not recent. that's all there is to the question. could you help with explaining the cases and reasons
     
  5. Dec 13, 2014 #4

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    To me, these questions seem self-explanatory. If you have a specific question about something which is unclear, I'll try to help. But simply saying 'Explain this' is too vague.
     
  6. Dec 13, 2014 #5
    the 2 parts of (d). could you explain. like give the reason and what I should have known to arrive that the conclusion (reason)
     
  7. Dec 13, 2014 #6

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Well, what happens when you shoot something out of a gun? Study the details given in section (c) and ask yourself if it would be safe for a man inside the spacecraft to be shot out of a gun.

    It takes a certain velocity to achieve orbit. By siting the gun on the equator, how does this help achieve that velocity? What does the earth do all day?
     
  8. Dec 14, 2014 #7
    thanks a lot. but sorry, i still can't figure it out

    could someone else plz help
     
  9. Dec 14, 2014 #8

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    (d)(i) Think about forces.
    (d)(ii) The sun does not go around the earth each day, right?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted