9.61:a) For a clockwise rotation, ωwill be out of the page. b ) The upward direction crossed into the radial direction is, by the right-hand rule, counterclockwise. ωand rare perpendicular, so the magnitude of rω×is .vωr=c) Geometrically, ωis perpendicular to ,vand so vω×has magnitude rad,aωv=and from the right-hand rule, the upward direction crossed into the counterclockwise direction is inward, the
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Clockwise, Right-hand rule, Arad, radial direction, upward direction