The heaviest loads ever raised were part of the offshore Ekofisk complex in
the North Sea. The 4.0 107 kg complex was raised 6.5 m by over a hundred
hydraulic jacks. The work done on the complex during the raising was
approximately 2.6 1011 J. Suppose the power output of all the jacks was
5.7 108 W. How long did it take the jacks to raise the complex

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by