372 Static Equilibrium and ElasticityP12.56(a)The height of pin B is100300500.sin..m maf°=.The length of bar BC is thenBC=°=45 0707.sin..mm.Consider the entire truss:1000 NBAC10.0 mnAnC30.0°45.0°FIG. P12.56(a)FnnnyACAC∑∑=−+== −°+°+° =100001 00010 030 010 030 0 7 0745 00NNτbg. cos.. cos..cos.Which gives nC=634 N .Then, nn=366N N.(b)Suppose that a bar exerts on a pin a force not along thelength of the bar. Then, the pin exerts on the bar aforce with a component perpendicular to the bar. Theonly other force on the bar is the pin force on the otherend. For F∑=0, this force must also have acomponent perpendicular to the bar. Then, the total
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .