Chapter 2559P25.26Consider the two spheres as a system.(a)Conservation of momentum:01122=+−mv±±iiejor vm22=By conservation of energy,012121222=−=++−+kqqdqrreebgandkqqdm2121221212+−=+vmkqqmm m r r dvvme121211 2 1 2196632222 0 7008 99 102 103 100 1000 8001810110010 801000700155=++−FHGIKJ=×⋅×××−FHGIKJ====−−−ejej.......kgN m CCCkgkgmmmskg 10.8 m skg(b)If the spheres are metal, electrons will move around on them with negligible energy loss toplace the centers of excess charge on the insides of the spheres. Then just before they touch,the effective distance between charges will be less than +and the spheres will really bemoving faster than calculated in (a) .P25.27Consider the two spheres as a system.(a)Conservation of momentum:0orvm22=.By conservation of energy,0121222=−−+qdqanddm2121221212++.vvmmvee122121221 2 1 222=−FHGIKJ
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