A group of wealthy and concerned citizens are concerned with large groups of people gathering in their town. They can hire a company named “Defense” or a company named “Shield” to patrol the town with this microwave producing machine on the larger Hummers defenses microwave produces waves with a frequency of 300×10^8 Hz, and Shields microwaves are produced the frequency of 800×10^8 Hz. Which is better and why?

Idont understand the question

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

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