You find that it is easier to increase your speed on your bike if you crouch
down and make your body as small as possible. how does this you?
o
a. it reduces the force of gravity.
o
b. it increases the force of air resistance.
o
c. it increases the force of gravity.
o
d. it reduces the force of air resistance.

its c its is a mixture of gases

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

i already answered it by 34/s