Which of the following explains why the Federal Aviation Administration and the United States Maritime Administration work closely with the U. S. Customs Agency? to prevent oil spills and other environmental disasters
to create specific regulations for weight loads on air and sea transports
to design entry and exit points out of the country to control air and sea flow
to ensure that no illegal substances are smuggled on air and sea transports

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