... k,m.N1005.1s150.02kg)600.0(2322πTπmk 13. 9: From Eq. (13. 12) and Eq. (13. 10), Hz,66.2s,375.021mN140kg500.0TfπTs.rad7.162 πfω 13. 10: a) )(so,)sin(2222txxωβωtAωadtxdx is a solution to Eq. (13. 4) ... (13. 19). b) At time ,0t Eq. (13. 21) becomes,21212121212020220202kxvωkkxmvkAwhere 2kωm (Eq. (13. 10)) has been used. Dividing by 2k gives Eq. (13. 19). 13. 22: ... and2maxm/s36kg)(0.500m)N/m)(0.040450(mkAad) From Eq. (13. 4), .m/s5 .13 2kg)(0.500m)0.015N/m)(450(xae) From Eq. (13. 31), J. 36.0m)N/m)(0.040450(221E 13. 25: a) max22222max .m/s5.13m)100.18(Hz)85.0(2)2(...