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: Finding the angle of the total acceleration of a point?

  1. Jan 28, 2014 #1
    A point on a rotating turntable 21.5 cm from the center accelerates from rest to a final speed of 0.740 m/s in 1.80 s. At t = 1.26 s,

    I found:

    Radial Acceleration: 1.25

    Tangential Acceleration: .4096

    Total Acceleration: 1.31

    Now, I'm having problems finding the total acceleration angle?

    I did:

    tan^-1(.411/1.25) and I got 18.2, but that isn't right?

    Thank you!
  2. jcsd
  3. Jan 28, 2014 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    You haven't specified a reference frame for the angle. Is it the angle to the radius or to some initial coordinate direction?
    Assuming it's to the radius (or, equivalently, to the tangent), the speed has nothing to do with it. You have the radial and tangential components of the acceleration as a vector; you just need to figure out the direction of the vector.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted