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!

Calc/Trig Hybrid

  1. Jan 15, 2008 #1
    1. The problem statement, all variables and given/known data

    A mass is suspended from the ceiling on a spring. It is pulled down to point P and then released. It oscillates up and down. Its distance, s cm, from the ceiling, is modeled by the function s=48 + 10cos([tex]\Pi[/tex]t) where t is the time in seconds from release.

    (a)What is the distance of the point P from the ceiling. Do not use a calculator

    (b) Find ds/dt

    2. Relevant equations

    The Unit Circle

    3. The attempt at a solution

    (a) I set it equal to zero, and then used the unit circle to find that cos([tex]\Pi[/tex]) = 1, but that doesn't take into account the t.
  2. jcsd
  3. Jan 16, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    The "point of initial release" is where t=0 isn't it? Besides cos(pi)=(-1).

    Signed, Confused.
    Last edited: Jan 16, 2008
  4. Jan 16, 2008 #3
    Oh, you're right about cos(pi)=(-1)
  5. Jan 16, 2008 #4


    User Avatar
    Staff Emeritus
    Science Advisor

    He's also right about the mass being at point P when t= 0!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Calc/Trig Hybrid