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 Tangential Acceleration

  1. Oct 31, 2004 #1
    The flywheel of a steam engine runs with a constant angular speed of 425 rev/min. When steam is shut off, the friction of the bearings stops the wheel in 1.7 h.

    At the instant the flywheel is turning at 75 rev/min, what is the tangential component of the linear acceleration of a flywheel particle that is 50 cm from the axis of rotation?

    I know the equation to use is At=(alpha)r, where alpha is dw/dt. In this case I'm not sure how to compute the alpha and I'm sure it's just a simple point that I am missing.
  2. jcsd
  3. Oct 31, 2004 #2
    first change the 1.7 hours to seconds, then the 425 rev/min to rad/s



    [tex]\alpha dt=d\omega[/tex]

    [tex]\int_{0}^{t}\alpha dt=\int_{\omega}^{0}d\omega[/tex]
  4. Oct 31, 2004 #3

    Doc Al

    User Avatar

    Staff: Mentor

    Use simple kinematics to find alpha: [itex]\alpha = \Delta \omega/\Delta t[/itex]. (Take care with your units, as Spectre5 advises.)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook