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: Angular acceleration of a blender

  1. Feb 25, 2010 #1
    1. The problem statement, all variables and given/known data
    The blades of a kitchen blender rotate counterclockwise at 2.2×10^4 rpm (revolutions per minute) at top speed. It takes the blender 2.1 seconds to reach this top speed after being turned on. What is the average angular acceleration of the blades?


    2. Relevant equations
    average angular aceleration=dw/dt

    3. The attempt at a solution
    after converting rpm to rotations per second I attempted 366.7rps/2.1s=174.6rad/sec
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Feb 25, 2010 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Convert rev/min to rad/sec, not rev/sec. (1 rev = ? radians?) And the acceleration will have units of rad/s^2.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook