1. Not finding help here? Sign up for a free 30min 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!

Question on energy conservation with centripetal acceleratio

  1. Apr 28, 2016 #1
    1. The problem statement, all variables and given/known data
    Untitled 2.jpg Untitled 3.jpg

    The right answer is E, and I have no idea how to solve this problem.

    Please advise on how to proceed. Thanks in advance.
    2. Relevant equations
    conservation of mechanical energy??

    3. The attempt at a solution
    Many attempts were done, but I am lacking on theory with this. How and why should I choose E and eliminate the other answers?

    Thanks!
     
  2. jcsd
  3. Apr 28, 2016 #2
    UPDATE: I was able to figure out why I and II are wrong, but I am now stuck on roman numeral III.

    Thanks in advance for the help
     
  4. Apr 28, 2016 #3

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    Consider the speed, v, at point B. How does this relate to H? How does it relate to the centripetal force at B?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted