Determine the principal planes and the principal stresses for the state of plane stress resulting from the superposition of the two states of stress shown. given: x 50 mpa and y 30 mpa. ay 80 mpa 30° + the orientation of the principal plane in the first quadrant is 120 the orientation of the principal plane in the second quadrant is 210 mpa, and the minimum principal the maximum principal stress is mра. stress is

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