a weightlifter raises a barbell of mass 100 kg from the floor to over his head (2.5 meters) in 2 seconds. what is his average power input? give ur answer in both watts and horse power

Question

Raymond Reynolds

Physics

2 April, 14:51

a weightlifter raises a barbell of mass 100 kg from the floor to over his head (2.5 meters) in 2 seconds. what is his average power input? give ur answer in both watts and horse power

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Rashad · Answer 1

bear in mind that Gravitational capacity potential = mass * height * g. So, a) (i) artwork achieved = substitute in potential = a hundred * 9.80 two * 2 = 1964 J (ii) The sideways movements make no distinction to the terrific artwork achieved. the burden nonetheless finally ends up 2 m from the floor, so the comparable volume of artwork must be achieved. artwork achieved = 1964 J b) whilst the burden is released, its PE is switched over into Kinetic potential. So, on the instantaneous beforehand is hits his toe, we've 1964 = (a million/2) m v^2 v^2 = 1964 / (0.5 * a hundred) = 39.28 v = ? (39.28) = 6.27 m/s