The heaviest loads ever raised were part of the offshore Ekofisk complex in the North Sea. The 4.0x 10 kg complex was raised 6.5 m by over a hundred hydraulic jacks. The work done on the complex during the raising was approximately 2.6x 101 J. Suppose the power output of all the jacks was 5.7x 10 W. How long did it take the jacks to raise the complex?

0.5s

Explanation:

Given parameters:

Mass of the complex  = 4 x 10kg

Distance moved  = 6.5m

Work done  = 2.6 x 10¹J

Power  = 5.7 x 10W

Unknown:

Time taken  = ?

Solution:

Power is the rate at which work is done.

  Power  =

  work done  = power x time

        time  =

  Insert the parameters;

       time  =   = 0.5s

gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.