Statics 8.30 - Two block A and B have a weight of 10 lb and 6 lb, respectively.

Question: Two block A and B have a weight of 10 lb and 6 lb, respectively. They are resting on the incline for which the coefficients of static friction are μA = 0.15 and μB = 0.25. Determine the incline angle θ for which both blocks begin to slide. Also find the required stretch or compression in the connecting spring for this to occur. The spring has a stiffness of k = 2 lb/ft.

Problem 8-30 from:

Engineering Mechanics: Statics, 14th edition
Russell C. Hibbeler

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[jokerski]

Thanks for taking the time to go through the whole problem. The hardest part is the solving for the unknowns.

[joseaejandrolopezsilva]

Buen video compare, saludos desde Monterrey ✌️

[MIJ.]

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[snowbording]

I think if the spring in unstretched there would be no force in it and you would not need to include the (2x) in the F.B.Ds