A tower crane (Fig. 12-48a) must always be
Chapter 12, Problem 12.4(choose chapter or problem)
A tower crane (Fig. 12-48a) must always be carefullybalanced so that there is no net torque tending to tip it.A particular crane at a building site is about to lift a2800-kg air-conditioning unit. The cranes dimensions areshown in Fig. 12-48b.(a) Where mustthe cranes 9500-kgcounterweight be *placed when theload is lifted frommoved automaticallyvia sensors andmotors to precisely compensate for the load.) (b) Determinethe maximum loadthat can be liftedwith this counterweightwhen it isplaced at its fullextent. Ignore themass of the beam.FIGURE 12-48 4.
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