A plane wave traveling through vacuum in the z direction encounters a perfect conductor occupying the region z ≥ 0, and reflects back: E(z, t) = E0 [cos(kz − ωt) − cos(kz + ωt)] ˆx, (z < 0). Requried:
a. Find the accompanying magnetic field (in the region z < 0).
b. Assuming B = 0 inside the conductor, find the current K on the surface z = 0, by invoking the appropriate boundary condition.
c. Find the magnetic force per unit area on the surface, and compare its time average with the expected radiation pressure.

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falling water hydro = water .. spectcular places these plants are

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.