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September 21, 2014

Homework Help: Physics

Posted by Ed on Monday, November 30, 2009 at 2:49pm.

A 46.5-cm diameter disk rotates with a constant angular acceleration of 2.4 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3 with the positive x-axis at this time.
(Hint: Remember the counter-clockwise rule for positive angular velocity and acceleration.)
(a) Find the angular speed of the wheel at t = 2.30 s.
___ rad/s

(b) Find the linear velocity and tangential acceleration of P at t = 2.30 s.
linear velocity ___ m/s
tangential acceleration __ m/s2

c) Find the position of P (in degrees, with respect to the positive x-axis) at t = 2.30s.
(Hint: Your answer must be between 0 and 360 degrees.)
____

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