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### $* *$ Determine the tension force that the horizo…

02:14
MO
Texas A&M University
Problem 57

# $* * B 10$ Lift with bent legs You injure your back at work lifting a $420-\mathrm{N}$ radiator. To understand how it happened, you model your back as a weightless beam (Figure $\mathrm{P} 7.57 )$ , analogousa)b)to the backbone of a person in a bent position when lifting an object. (a) Determine the tension force that the horizontal cable exerts on the beam (which is analogous to the force the back muscle exerts on the backbone) and the force that the wall exerts on the beam at the hinge (which is analogousto the force that a disk in the lower back exerts on the backbone). (b) Why do doctors recommend lifting objects with the legs bent?

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