How much work is a 200 kg weightlifter doing while he holds a 1000 kg barbell stationary .75 m over his head?
1000(.75)
= 7350 J
To calculate the work done by the weightlifter while holding the barbell stationary over his head, you can use the formula:
Work = Force x Distance
In this case, the force is equal to the weight of the barbell, which is the mass of the barbell multiplied by the acceleration due to gravity (9.8 m/s^2). The distance is the height at which the barbell is held.
Given that the weightlifter weighs 200 kg and the barbell weighs 1000 kg, the total force is:
Force = (weightlifter's mass + barbell's mass) * acceleration due to gravity
= (200 kg + 1000 kg) * 9.8 m/s^2
Now, we can calculate the work:
Work = Force * Distance
= [(200 kg + 1000 kg) * 9.8 m/s^2] * 0.75 m
= 11760 J
Therefore, the work done by the weightlifter while holding the barbell stationary 0.75 m over his head is 11760 J.