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A 150-lb block is placed on a 29∘ incline and released from rest. The coefficient of static friction between the block and the incline μs is 0.31. (a) Determine the maximum and minimum values of the initial tension T in the spring for which the block will not slip when released. (b) Calculate the friction force F (positive if up the slope, negative if down) on the block if T = 77 lb. Assume W = 150 lb, θ = 29∘. Answers: (a) Tmax = lb, Tmin = Ib (b) F = Ib

A 150-lb block is placed on a 29∘ incline and released from rest. The coefficient of static friction between the block and the incline μs is 0.31. (a) Determine the maximum and minimum values of the initial tension T in the spring for which the block will not slip when released. (b) Calculate the friction force F (positive if up the slope, negative if down) on the block if T = 77 lb. Assume W = 150 lb, θ = 29∘. Answers: (a) Tmax = lb, Tmin = Ib (b) F = Ib

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A 150-lb block is placed on a 29 ∘ incline and released from rest. The coefficient of static friction between the block and the incline μ s is 0.31 . (a) Determine the maximum and minimum values of the initial tension T in the spring for which the block will not slip when released. (b) Calculate the friction force F (positive if up the slope, negative if down) on the block if T = 77 l b . Assume W = 150 l b , θ = 29 ∘ .
Answers: (a) T max = i l b , T min = I Ib (b) F = ◻ I b

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