Using the method of Sec 4 7, Solve Prob 4 21 Problem 4 21 The required force to be exerted at A by lever ABC is 3 lb Knowing g that alpha 30 deg and that the spring has been stretched 1 2 in , determine (a) The constant k of the spring (b) The reaction at B DI 0 9 in a 2 4 in 1 4 in

Question: Using the method of Sec. 4.7, Solve Prob. 4.21 Problem 4.21: The required force to be exerted at A by lever ABC is 3 lb.

Using the method of Sec. 4.7, Solve Prob. 4.21 Problem 4.21: The required force to be exerted at A by lever ABC is 3 lb. Knowing g that α =30° and that the spring has been stretched 1.2 in., determine
(a) The constant k of the spring
(b) The reaction at B.

DI 0.9 in. }a -2.4 in.- 1.4 in

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