57. Before the launch, the mechanical energy ismech,00EΔ=. At the maximum height hwhere the speed of the beetle vanishes, the mechanical energy is mech,1Emgh. The change of the mechanical energy is related to the external force by mechmech,1cosavgEEEmghFdφΔ−Δ==,whereFavgis the average magnitude of the external force on the beetle. (a) From the above equation, we have
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