vibrations Q: Use Lagrange's equations to drive the differential equations governing the motion of the systems shown in Fig. below. Use the indicated generalized coordinates. Thin disk of XC mass m and radius Idler pulley 2k r rolls without slip relative to center of cart. xp is absolute displacement of 2m mass center of disk.

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A: Use kinematic expression to find the time elapsed v=u+att=v-ua=27.4 m/s-9.4 m/s3.8 m/s2=4.74 s

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Q: Write the history of electicity in your own words. 2-3 paragraphs.

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