02 points I Previous Answers Tipler6 9.P060. My Notes Ask Your Teac A wheel free

Question

02 points I Previous Answers Tipler6 9.P060. My Notes Ask Your Teac A wheel free to rotate about its axis that is not frictionless is initially at rest. A constant external torque of +58 Nm is applied to the wheel for 15 s, giving the wheel an angular velocity of +580 rev/min. The external torque is then removed, and the wheel comes to rest 120 s later. (Include the sign in your answers.) (a) Find the moment of inertia of the wheel 14.32 kg-m2 (b) Find the frictional torque, which is assumed to be constant 7.248

Explanation / Answer

Let the moment of inertia is I,let friction torque is T

T*120=I*(580*2pi/60)).......(1)

Iw=torque*time

I*(580*2pi/60)=(58-T)*15

Answer (b) is

T=-6.4 Nm

Answer (a) is

I=12.72 kgm^2

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