D. Roberts PHYS 121 University of Maryland Physic² 121: Phundament°ls of Phy²ics I November 22, 2006.

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D. Roberts PHYS 121 University of Maryland Physic² 121: Phundament°ls of Phy²ics I November 22, 2006

D. Roberts PHYS 121 University of Maryland Chapter 8 Rotational Equilibrium and Rotational Dynamics

D. Roberts PHYS 121 University of Maryland Example Problem (8.29) Four objects are held in position at the corners of a rectangle by light rods as shown in the figure. Find the moment of inertia of the system about –(a) the x-axis, –(b) the y-axis, and –(c) an axis through O and perpendicular to the page. –What are the coordinated of the center-of-gravity?

D. Roberts PHYS 121 University of Maryland Example Problem (8.33) A cylindrical fishing reel has a moment of inertia I = 6.8 × 10 –4 kg∙m 2 and a radius of 4.0 cm. A friction clutch in the reel exerts a restraining torque of 1.3 N∙m if a fish pulls on the line. The fisherman gets a bite, and the reel begins to spin with an angular acceleration of 66 rad/s 2. –(a) What is the force exerted by the fish on the line? –(b) How much line unwinds in 0.50 s?