Posted by **Dani** on Tuesday, May 3, 2011 at 4:53pm.

An electric motor rotating a workshop grinding wheel at a rate of 95 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.40 rad/s2.

(a) How long does it take for the grinding wheel to stop?

(b) Through how many radians has the wheel turned during the interval found in (a)?

- Physics -
**Henry**, Wednesday, May 4, 2011 at 9:59pm
a. V=95rad/min * 6.28rad/rev * (1/60)min/s = 9.94rad/s.

Vf = Vo - at = 0,

9.94 - 2.4t = 0,

-2.4t = - 9.94,

t = 4.14s.

- Physics -
**Henry**, Wednesday, May 4, 2011 at 10:05pm
b. d=9.94rad/s * 4.14s = 41.2 radians.

- Physics -
**Taylor**, Monday, October 17, 2011 at 8:37pm
For part B you have to divide the 9.94 by 2 then multiply by time

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