A uniform circular disk of mass m 5 24.0 g and radius r 5
Chapter 34, Problem 39(choose chapter or problem)
A uniform circular disk of mass m 5 24.0 g and radius r 5 40.0 cm hangs vertically from a fixed, frictionless, horizontal hinge at a point on its circumference as shown in Figure P34.39a. A beam of electromagnetic radiation with intensity 10.0 MW/m2 is incident on the disk in a direction perpendicular to its surface. The disk is perfectly absorbing, and the resulting radiation pressure makes the disk rotate. Assuming the radiation is always perpendicular to the surface of the disk, find the angle u through which the disk rotates from the vertical as it reaches its new equilibrium position shown in Figure 34.39b.
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