Chapter 8245*P8.68If the spring is just barely able to lift the lower block from the table, the spring lifts it through nonoticeable distance, but exerts on the block a force equal to its weight Mg. The extension of thespring, from Fskx=, must be Mg k. Between an initial point at release and a final point when themoving block first comes to rest, we haveKU U K U Uigisifgfsf++=++:0412401222+−FHGIKJ+FHGIKJ=+FHGIKJ+FHGIKJmgmgkkmgkmgMgkkMgk−+=++−==−±−−=− ±482422404429222222122122mgkkmMgkMgkmmMMMmMmMmchejOnly a positive mass is physical, so we take Mmm=−=31 2af.P8.69(a)Take the original point where the ball isreleased and the final point where itsupward swing stops at height Handhorizontal displacementxLLHLHH−=−2222afSince the wind force is purely horizontal, it
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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 .