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Pupil
Karma Points: 50
Respect (80%):
Date Posted: 6/18/2008 4:47:56 PM  Status: Live
Find angular acceleration
Course Textbook Chapter Problem
Algebra Based Physics Enhanced College Physics (7th) by Bennett, Vuille, Faughn 7 5P
Question Details:
A densist's drill starts from rest. After 3.20s of constant angular acceleration, it turns at a rate of 2.51 X104 rev/min.
A. Find the drill's angular acceleration.
B. Determine the angle (in radians) through which the drill rotates during this period.
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Oracle
Karma Points: 13,361
(Santa Fe Community College-New Mexico)
Date Posted: 6/18/2008 5:18:41 PM  Status: Live
Asker's Rating: Lifesaver   
Response:
a) α=Δω/Δt, so first convert to rad/s  -- 2.51x104rev/min(1min/60s)(2πrad/1rev)= 2628.5 rad/s and the acceleration is α= (2628.5 rad/s)/(3.2s)= 821.4rad/s2
b) Δθ=1/2αt2=1/2(821.4)(3.2)2=4205.5 rads.
Niknack23's Comment:
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