At the Beijing Olympics a Chinese female weightlifter set a new world record. She lifted 117 kg, holding it stationary for a specified time. Her own mass was 47kg. Assume that before the attempt, the centre of mass of the bar and “weights” combined was 0.15 m above the floor, and while she was holding the bar aloft, its centre of mass was 1.65 m above the floor. How much work did she do on the bar and weights during the attempt? a.How much work did she do on the bar and weights during the attempt? b.Assuming the lift took 0.2s to complete, what was her power output during the lift?
At the Beijing Olympics a Chinese female weightlifter set a new world record. She lifted 117 kg, holding it stationary for a specified time. Her own mass was 47kg. Assume that before the attempt, the centre of mass of the bar and “weights” combined was 0.15 m above the floor, and while she was holding the bar aloft, its centre of mass was 1.65 m above the floor. How much work did she do on the bar and weights during the attempt? a.How much work did she do on the bar and weights during the attempt? b.Assuming the lift took 0.2s to complete, what was her power output during the lift?
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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At the Beijing Olympics a Chinese female weightlifter set a new world record. She lifted 117 kg, holding it stationary for a specified time. Her own mass was 47kg. Assume that before the attempt, the centre of mass of the bar and “weights” combined was 0.15 m above the floor, and while she was holding the bar aloft, its centre of mass was 1.65 m above the floor. How much work did she do on the bar and weights during the attempt?
a.How much work did she do on the bar and weights during the attempt? b.Assuming the lift took 0.2s to complete, what was her power output during the lift?
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