ch08-p057 - 57. Before the launch, the mechanical energy is...

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57. Before the launch, the mechanical energy is mech,0 0 E Δ= . At the maximum height h where the speed of the beetle vanishes, the mechanical energy is mech,1 E mgh . The change of the mechanical energy is related to the external force by mech mech,1 cos avg EE E m g h F d φ Δ Δ == , where F avg is the average magnitude of the external force on the beetle. (a) From the above equation, we have
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