TV broadcast antennas are the tallest artificial structures on Earth. In 1987, a 74.0 kg physicist placed himself and 400 kg of equipment at the top of one 610 mhigh antenna to perform gravity experiments. By how much (in mm) 'was the antenna compressed, if we consider it to be equivalent to a steel cylinder 0.180 min radius? (Assume a Young's modulus of 20 × 10¹0 Pa.)1.3919E-4 X mmA copper wire of diameter 1.2 cm stretches 0.02% when it is used to lift a load upward with an acceleration of 2.1 m/s². What is the weight of the load (in kN)?X KN217.945+

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