Current location - Health Preservation Learning Network - Healthy weight loss - (20 14? As shown in the figure, an athlete with a mass of 60kg lifts the barbell of 140kg 1.7s m in one training session.
(20 14? As shown in the figure, an athlete with a mass of 60kg lifts the barbell of 140kg 1.7s m in one training session.
(1)∫F total =G total =m total g = (140+60) kg×10n/kg = 2×103n,

∴p=F Total S=2× 103N5× 10? 2 m2 = 4× 104 pa； ?

(2)∵g 1 = m 1g = 140kg× 10N/kg = 1.4× 103n，

∴w=g 1h= 1.4× 103n× 1.7m=2.38× 103j；

(3)P = Wt = 2.38× 103j 0.7s = 3.4× 103 w。 ?

Answer: (1) His pressure is 4×104 Pa;

(2) The work done by the athletes in lifting barbells this time is at least 2.38×103j; j；

(3) The power for athletes to lift barbells should be at least 3.4× 103W. w .

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