338 Angular Momentum*P11.38(a)Let ωbe the angular speed of the signboard when it is vertical.1212131213139801250050235222IMghMLMgLgLωθθ=∴FHGIKJ=−∴=−=−°=coscos.cos...afej±msmrad s2Mg mv12L FIG. P11.38(b)IImvLff iiωωrepresents angular momentum conservation∴+FHGIKJ−+=−+=131324005234704160498213131313MLmLMLmvLMLmvMmLfifichbgbgbg.......kgmrad skgm skgkgmrad s(c)Let hCM=distance of center of mass from the axis of rotation.hCMkgmkgmkgkgm=++=02502857....Apply conservation of mechanical energy:ghML mLLgh+−=+FHGIKJ−++LNM
This is the end of the preview. Sign up
access the rest of the document.
This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .