What is the work done by gravity as a 10 kg object falls from rest at 12m to 5m?

686 joules

Explanation:

Work done = ?

Mass of fallen object = 10 kg

Height = (12m - 5m) = 7metres

(The height is 7metres because the object fell from an height of 12m to 5m)

Acceleration due to gravity g = 9.8m/s2

Workdone = Mass x Acceleration due to gravity x height

= 10kg x 9.8m/s2 x 7 metres

= 686 joules

Thus, the work done by gravity is 686 joules

dang that balls went far

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