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-3 http://session.masteringphysics.com/myct/itemview? C MMasteringPhysics c... x CA Toy Top with A spoo... Web 2.0 scientific calcul... B Blackboard Learn Y A solid cylinder with a r signed in as Destinee Sapp Help cose PHY 114AB FALL 2014 Resources Chapter 07 Problems Problem 11 previous l 11 of 12 l next Problem 11 Part A How long does it take for the top to A toy top with a spool of diameter 5.1 cm has a moment of inertia of 2.0x10 plete th rst five revolutions? The string is long ugh that it nd the top five turns. kg m2 about its rotation axis. To get the top spinning, its string is pulled with a Express your answer using two significant figures. tension of 0.28 N Submit My Answers Give Up Eeedback Continue R 9:57 PM 11/4/2014Explanation / Answer
Tension = I *alpha
where alpha is acceleration
alpha =0.28/( 2.9*10-5 )
also s = ut +0.5 a*t*t
for angular, equation changes to
theta = w0t + 0.5*alpha*t*t
w0=0
theta = 2*pie*5 // this is total 5 revolution displacement. t from this variable will us our required time.
2*pie*5 = 0.5 * 0.28/( 2.9*10-5 ) *t2
t = 0.08 sec
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