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4. Una viga uniforme de masa m se inclina en un ángulo θ con la horizontal (gura 4). Su extremo superior
produce una inclinación de 90 grados
en una soga muy rugosa amarrada a una pared, y su extremo inferior
descansa sobre un suelo rugoso.
a) Sea µ s el coefciente de fricción estática entre viga y suelo. Suponga que µ s es menor que la cotangente
de θ. Determine una expresión para la masa máxima M que se puede suspender desde lo alto antes
de que la viga se deslice.
b) Determine la magnitud de la fuerza de reacción en el suelo y la magnitud de la fuerza que ejerce la
viga sobre la soga en P en términos de m, M y µ s.
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Answers: 3
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4. Una viga uniforme de masa m se inclina en un ángulo θ con la horizontal (gura 4). Su extremo supe...
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