An airplane maintains a speed of 669 km/h relative to the air it is flying through as it makes a trip to a city 675 km away to the north. (a) What time interval is required for the trip if the plane flies through a headwind blowing at 33.0 km/h toward the south

1.06 h

Explanation:

Assuming that the airplane is traveling through the air, moving at a sites relative to the ground. The airplane is expected to make a displacement of 675 km due North.

Let north y be positive, and west x also be positive, then

With the wind blowing at 33 km/h due South. We then say,

The northern component of the velocity of the airplane you the ground is

669 km/h - 33 km/h = 636 km/h

Then, the time interval taken by the airplane to travel 675 km is

675 / 636 = 1.06 h

Therefore, we can conclude that the answer is 1.06 h

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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