4. The work done by the applied force aFGis given by cosaaWFdFdφ=⋅=GG. From Fig. 7-24, we see that 25 JW=when0=and5.0 cmd=. This yields the magnitude of aFG:25.0 10 N0.050 maWFd===×.(a) For 64=°, we have
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