A 90-kg ceiling light is suspended 4 m above the floor. What is its gravitational potential energy?

The answer to your question is Pe = 3531.6 J

Explanation:

Data

mass = 90 kg

height = 4 m

acceleration due to gravity = g = 9.81 m/s²

Formula

Potential energy = Pe = mgh

Process

Potential energy is the energy of an object due to its position.

1.- Substitution

Pe = (90)(9,81)(4)

2.- Simplification and result

Pe = 3531.6 J

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.