Ignoring air resistance, an object in free fall will fall d feet in t seconds, where d and t are related by the algebraic model d equals 16 t squared. (a) how long will it take the object to fall 1148 ft? (b) if the object is in free fall for 18.5 sec after it is dropped, how high was the object when it was dropped?

Explanation:

Given that,

An object in free fall will fall d feet in t seconds, where d and t are related by the algebraic model as :

..........(1)

(a) We need to find the time taken by the object to fall 1148 ft. Put this in equation (1) as :

t = 8.47 seconds

(b) If the object is in free fall for 18.5 sec after it is dropped, then the height of the object is given by :

d = 5476 ft

Hence, this is the required solution.

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