Briefly describe an earth-centered, earth-fixed coordinate system.

match the words in the left column to the appropriate blanks in the sentences on the right. make certain each sentence is complete before submitting your answer. words may be used more than once.

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z axis

left-handed

x axis

y axis

origin

right-handed

an ecef coordinate system is an earth-based three-dimensional coordinate system with its at the mass-center of the earth, its aligned with the semi-minor (spin) axis of the earth defined at some epoch, its in the plane of the equator passing through mean greenwich meridian, and its in the plane of the equator and creating a coordinate system.

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg. a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg.m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?