1/28/11 1 Physics 1221/28/11 3 Physics 1221/28/11 4 Physics 1221/28/11 6 Physics 122 I have posted a reading on how to do estimation problems on our BB site together with a sample solved problem.1/28/11 7 Physics 1221/28/11 8 Physics 1221/28/11 9 Physics 1221/28/11 13 Physics 1221/28/11 14 Physics 122 tvatrv==1/28/11 15 Physics 1221/28/11 16 Physics 1221/28/11 17 Physics 1221/28/11 18 Physics 122 mFanet=ABBAFF=1/28/11 19 Physics 1221/28/11 20 Physics 122 lkT =staticABkineticABBAkineticABBABAstaticABBABANfNffμμμμ==sliding slidingnot max2GmMWRmgR= 1/28/11 21 Physics 1221/28/11 22 Physics 122 vmp=tFnet=Ip=I1/28/11 23 Physics 122 221mvKE =rFnet=Work ()rFmvnet= 2211/28/11 24 Physics 122 12mv2+U()=Fnon consnet rUg= mgh Uspr=12k l()21/28/11 25 Physics 122 () ( )221122112211vmvmvmvmvmvmffii=+=+()0)()()(221221221=++=+rUmvrUmvrUmvffii1/28/11 26 Physics 1221/28/11 27 Physics 122 =iiirMmR1/28/11 28 Physics 122 tt== (radians) RaRvRs=== (radians)1/28/11 29 Physics 122 RmvFRvaradialradial22==1/28/11 30 Physics 122 =iiirmI 2FR=0 0net==netF1/28/11 31 Physics 122 yyxxBABAABBA +==cosA B A cos Useful for finding Work. (Why?) A B A sin BAABUseful for finding Torque. (Why?) xyyxBABAABBA == sin1/28/11 32 Physics 122 ApF=gdppfluid+=0p0A pA W = mg1/28/11 33 Physics 122 Av = constantp = ZJZ =8μLA21/28/11 34 Physics 122 12 QQQCTmcTQmL= = = =temperature change, no phase change phase change, no temperature change m1 T1 m2 T2 m1 Tf m2 Tf Q1/28/11 35 Physics 122 T = TH TC = heat flow (energy/sec)T = Z Z
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