Question
Asked Nov 20, 2019
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Chapter 15, Problem 039
The balance wheel of a watch oscillates with angular amplitude 0.64n rad and period 0.68 s. Find (a) the maximum angular speed of the wheel, (b) the angular speed of the wheel at displacement 0.64n/2 rad, and (c) the magnitude of the
angular acceleration at displacement 0.64n,/4 rad.
(a) Number
Units
(b) Number
Units
(c) Number
Units
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Chapter 15, Problem 039 The balance wheel of a watch oscillates with angular amplitude 0.64n rad and period 0.68 s. Find (a) the maximum angular speed of the wheel, (b) the angular speed of the wheel at displacement 0.64n/2 rad, and (c) the magnitude of the angular acceleration at displacement 0.64n,/4 rad. (a) Number Units (b) Number Units (c) Number Units

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Expert Answer

Step 1

Given information:

Angular amplitude (A) = 0.64π rad

Time period (T) = 0.68 s

Step 2

The equation of motion for the oscillation is:

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A sin (wt) y Hence the velocity is given by: y' = Aw cos (wt) The angular acceleration is given by: y"-Aw2 sin (wt) Part a Maximum angular speed of the wheel (omax): 2T 2TT 0.64 = 0.64 5.91 rad/sec Aw Wmax = 0.68

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Step 3

Part b:

We know ...

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2T т Substitute this in the equation of velocity we get: y' Aw cos At an angular displacement of 0.64t/2 we get time (t) as T/8, substitute this equation in the above equation: xA cos 4.17 rad/s y' = Aw cos X = 4

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Angular Motion

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