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 ’.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)