2.28 Una viga está sostenida por una ménsula AB que ejerce una fuerza hacia arriba de 95 lb (véase figura 2.45). Determinar:
a) El momento con respecto al punto ‘O ’ de todas las fuer-zas que actúan sobre la viga.
b) Las reacciones en el apoyo ‘O ’.

An engine, weighing 3000 n, is supported on a pedestal mount. it has been observed that the engine induces vibration into the surrounding area through its pedestal at the maximum operating speed. determine the stiffness of the dynamic vibration absorber spring in (n/m) that will reduce the vibration when mounted on the pedestal. the magnitude of the exciting force is 250 n, and the amplitude of motion of the auxiliary mass is to be limited to 2 mm note: in this question type-in right numbers, no decimals, no fractions, no unit. approximate to right number if needed