198 Energy and Energy Transfer*P7.21The same force makes both light springs stretch.(a)The hanging mass moves down byxx xmgkmgkmgkk=+=+=+FHGIKJ=+FHGIKJ=×−121221115112001204 10..kg 9.8 m smNm1800 Nm2(b)We define the effective spring constant askFxmgmgkk==+FHGIKJFHGIKJ=−−72011bgm1200 Nm±Nm*P7.22See the solution to problem 7.21.(a)xmgFHGIKJ(b)kFHGIKJ−1P7.23kFx=LNMOQP⋅=Nmkg m smkgs22Section 7.5Kinetic Energy and the Work-Kinetic Energy TheoremSection 7.6The Non-Isolated System—Conservation of EnergyP7.24(a)KA120600200
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