Physics, 11.02.2020 17:06 lorettawintx
In the Olympiad of 708 B. C. some athletes competing in the standing long jump used handheld weights called halteres to lengthen their jumps. The weights were swung up in front just before liftoff and then swung down and thrown backward during the flight. Suppose a modern 83 kg long jumper similarly uses two 5.30 kg halteres, throwing them horizontally to the rear at his maximum height such that their horizontal velocity is zero relative to the ground. Let his liftoff velocity be V = (9.5i + 4.0j) m/s with or without the halteres, and assume that he lands at the liftoff level. What distance would the use of the halteres add to his range?
Answers: 2
Physics, 21.06.2019 22:20
Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage
Answers: 2
In the Olympiad of 708 B. C. some athletes competing in the standing long jump used handheld weights...
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