Homework Help: Physics

Posted by Sam on Thursday, November 4, 2010 at 8:18pm.

A dentist's drill starts from rest. After 3.20 s of constant angular acceleration it turns at a rate of 2.7 104 rev/min.
(a) Find the drill's angular acceleration.
(b) Determine the angle (in radians) through which the drill rotates during this period.

Physics - Henry, Saturday, November 6, 2010 at 1:02am
V = 2.7104 rev / min.
V = 2.7104 rev/min * 1 / 60 min/s = 0.04517 rev/s.

a. a = 0.04517 rev/s / 3.2 s =
0.01412 rev/s^2.

b. A = 0.04517 rev/s * 3.2 s * 6.28 rad/rev = 0.91 Radians.
Physics - yeah, Sunday, October 2, 2011 at 7:16am
i've a question, where did u get 6.28 rad/rev?
Physics - Anonymous, Thursday, November 3, 2011 at 12:31am
2pie equals 6.28
Physics - Tina, Monday, November 12, 2012 at 12:12pm
I have a question. 2.7104 was that suppose to actually be 2.7*10^4?

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