Results 1 to 2 of 2

Math Help - Sinusoidal Graph Problem

  1. #1
    Newbie
    Joined
    May 2010
    Posts
    1

    Exclamation Sinusoidal Graph Problem

    Homework for my Pre-Cal block A class...its cold up here in the north and I think my brain is frozen

    Anyway, there is a lime-green pendulum that measures 16 inches from the top to the ball at the end of the string. The pendulum is 5 inches off the ground on a cinder block. The balls height is 8 inches off the ground at the following times: 2s, 4s...7s, 9s...So how high does the pendulum swing?

    Also, the height from the ground to the top of the pendulum is 21 inches which I presume one could deduce from the info above...
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    11,319
    Thanks
    1241
    Quote Originally Posted by ChiTown66 View Post
    Homework for my Pre-Cal block A class...its cold up here in the north and I think my brain is frozen

    Anyway, there is a lime-green pendulum that measures 16 inches from the top to the ball at the end of the string. The pendulum is 5 inches off the ground on a cinder block. The balls height is 8 inches off the ground at the following times: 2s, 4s...7s, 9s...So how high does the pendulum swing?

    Also, the height from the ground to the top of the pendulum is 21 inches which I presume one could deduce from the info above...
    We're not supposed to provide full solutions to anything that counts towards your final grade (in other words, homework questions), but just as a hint, write the general sinusoidal function...

    h = a\sin{(bt + c)} + d.


    You have several (t, h) points that lie on this curve, namely (0, 5), (2, 8), (4, 8), (7, 8), (9, 8).

    If you substitute these values in, you will be able to solve the equations simultaneously for a, b, c, d.

    If you're really clever, you'll be able to find the period straight away, and the period = \frac{2\pi}{b}... so you could solve for b...
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. sinusoidal graph axis
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: January 14th 2012, 10:20 AM
  2. Quick Sinusoidal Problem Help
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: May 22nd 2010, 02:33 PM
  3. Sinusoidal equation problem
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: May 12th 2010, 06:47 AM
  4. Sinusoidal Word Problem
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: November 6th 2009, 12:22 AM
  5. Ferris Wheel Sinusoidal problem
    Posted in the Trigonometry Forum
    Replies: 5
    Last Post: January 19th 2007, 04:04 AM

Search Tags


/mathhelpforum @mathhelpforum