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517. Determine the normal reactions at the points of contact at A, B, and C of the bar in Prob. 59.
518. Determine the horizontal and vertical components of reaction at pin C and the force in the pawl of the winch in Prob. 510.
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553. Determine the angle u at which the link ABC is held in equilibrium if member BD moves 2 in. to the right. The springs originally are unstretched when u = 0. Each spring has the stiffness shown. The springs remain horizontal since they are attached to roller guides.
kCF F
100 lb/ft
C
u 6 in. D B 6 in. E kAE 500 lb/ft A F
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554. The uniform rod AB has a weight of 15 lb and the spring is unstretched when u = 0. If u = 30, determine the stiffness k of the spring.
k
6 ft u 3 ft B
A
555. The horizontal beam is supported by springs at its ends. Each spring has a stiffness of k = 5 kN> m and is originally unstretched so that the beam is in the horizontal position. Determine the angle of tilt of the beam if a load of 800 N is applied at point C as shown.
800 N
C A B
1m 3m
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