AT&T; LTE 8:23 AM s.com Problem 8.38 MasteringPhysics A small 340-gram ball on t

Question

AT&T; LTE 8:23 AM s.com Problem 8.38 MasteringPhysics A small 340-gram ball on the end of a thin, light rod is rotated in a horizontal circle of radius 0.90 m Part A Calculate the moment of inertia of the ball about the center of the circle. Express your answer to two significant figures and include the appropriate units. |= | Value |kg . m- Submit R equest Answer Part B Calculate the torque needed to keep the ball rotating at constant angular velocity if air resistance exerts a force of 0.030 N moment of inertia. on the ball. Ignore air resistance on the rod and its Express your answer to two significant figures and include the appropriate units. /71 = | Value | m N Submit Request Answer Next

Explanation / Answer

(A) I = m r^2 = 0.340 x 0.90^2

I = 0.2754 kg m^2

(B) torque = r F = 0.90 x 0.030

= 0.027 N m

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