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UNIVERSIDAD NACIONAL INGENIERÌA

Facultad de ingeniería geológica, Minera y Metalúrgica. AREA DE CIENCIAS BASICAS Solucionario de 2 da practica calificada Alumno: Aguirre Angulo, Jesús Santiago Código : 20180603E 1. Calcular la resultante y el momento resultante en o de la Fig. 1

1. 2. 3. 4. 5.

̅̅̅̅ 𝐹1=50(0,-1, √3) ̅̅̅̅ 𝐹2=30(0,- √3,-1) ̅̅̅̅ 𝐹3=150(0,0,-1) ̅̅̅̅ 𝐹4=50(-1,0,0) ̅̅̅̅ 𝐹5=60(0,0,-1)

r1=5(0, √3,1) r2=10(0, √3,1) r3=5(1,0,0) r4=10(1,0,0) r5=(10,0,0

6. ∑ 𝐹̅ 𝑥 = −50𝑖 7. ∑ 𝐹̅ 𝑦 = (−50, −30√3)𝑗 8. ∑ 𝐹̅ 𝑧 = (50√3, −240)𝑘 ∑ 𝐹̅ = −50𝑖 + (−50 − 30√3)𝑗 + (50√3 − 240)𝑘

𝑇̅= 𝑟̅x 𝐹̅ 𝑇̅1=5(0,√3,1) x 50(0,−1,√3) = 250(4,0,0) 𝑇̅2=10(0, √3,1) x 30(0,- √3,-1) x 30(0,- √3, −1) = 0 𝑇̅3=5(1,0,0) x 150(0,0,-1) = 750(0,1,0) 𝑇̅4=10(1,0,0) x 50(-1,0,0) = 0 𝑇̅5=2(5,1,0) x 60(0,0,-1) = 120(-1,5,0) 𝑇̅6=200(-1,0,0) 𝑇̅7=90(0,- √3,-1) 𝑇̅8=100(0,-1,0)

̅ = 𝟔𝟖𝟎𝒊 + (𝟏𝟐𝟓𝟎 − 𝟗𝟎√𝟑)𝒋 − 𝟗𝟎𝒌 ∑𝑻

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