Question

1. If block D weights 300 lb and block B weighs 275 lb, determine the required weight of blockC and the angle 0 for equilibrium. 30 B

Answer 1

3oolb EFy=0 Consider Equilibrium at joint a FAB Fee PAR = 8275 lb EFx=0 >> FAB Coso - Foc Cos 30°=0 3 >> 275 Cos0 - Pocx senzo edo Foc - 550 caso no - FAB sinot For Sin 30° -300 =0 = 275 Sino + Foc d = 300 >> 275Sino + 550xCoso xt=300 from 0) 95063 sino a 550 caso 1039. > 275 (sino + eles coso) = 30 -> 223 @ Gos 12800 53 sino + Coso = 300 x multiply & divide with a 23. sino + ĻOSO) = 3953 2 (Gossino + Sin 30 GO) = 300 » sin (0+30) = 150x13 = 70.866 weight of block 'C' To=40.866° SOR 27593 275x3 0+30° = 70.866 o weight of 940014861