A typical car gas tank holds 15 gallons. (a) Calculate the energy content of this much gasoline. (b) calculate the chemical energy content of 15 gallons of hydrogen gas under normal atmospheric pressure (12.8 MJ/m3 as described under Equation 11.4), and compare your answer with the energy in the gasoline. Your answer shows why pressurizing, liquefying, or chemically combining hydrogen is necessary in hydrogen- powered vehicles.

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Because the dept in the ocean

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j