(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A stroboscope is a light that flashes on and off at a constant rate. It can be used to illuminate a rotating object, and if the flashing rate is adjusted properly, the object can be made to appear stationary.

(a) What is the shortest time between flashes of light that will make a three-bladed propeller appear stationary when it is rotating with an angular speed of 12.6 rev/s?

(b) What is the next shortest time?

2. Relevant equations

ω=(∆θ)/(∆t)

3. The attempt at a solution

I took ∆θ = ⅓ rev (2pi radians/1 rev) = 2.09 radians

then I used ω=(∆θ)/(∆t)...

12.6 = (2.09/t) which gives me t=.166

What I did makes sense to me, but the answer is wrong so obviously I am too...Don't know what else to do...

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# Rotational Motion and Angular Displacement

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