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8 https://session.masteringphysics.com/myct/itemView?assignmentProblemiD-59406497 Physics 201 Spring 2016 Week 5 (aradod)Problem 6 06 eip a previous3 of 20 Problem 6.06 Part A What is the coefficient of static friction between the button and the platform? Express your answer to three significant figures. A small button plac ed on a horizontal rotating platform with diameter 0.326 m will revolve with the platform when it is brought up to a rotational speed of 35.0 rev/min, provided the button is no more than 0.144 m from the axis 069 Submit My Answers Give Up Incorrect; Try Again; 3 attempts remaining Part B How far from the axis can the buttion be placed, without slipping, if the platform rotates at 56 0 rev/min? Express your answer to three significant figures. in 0

Explanation / Answer

at r = 0.144m ; v = 2 x 3.14 x 0.144 x 35/60 = 0.5278m/s

coefficient friction µ = Fc / Fn = ma/mg = a/g

a = v^2/r = 0.5278^2/0.144 = 1.9345m/s^2

µ = 1.9345 / 9.8 = 0.197

b)

b)r=g/2=0.197*9.8/(56*2/60)2=0.0561m=5.61cm

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