Assume a person has a mass of 50.0kg and the Earth has a mass of 5.98 x 10^24kg. If the radius of Earth is given by 6.38 x 10^6m. a) find the gravitational force between the person and Earth
b) Find the weight of the person
c) how do these answers compare?

a) F =489.95 N

b) W = 490 N

c) both have same value

Explanation:

a)

The force of gravitation between two objects is given by Newton's Law of Gravitation. According to this law:

where,

F = Gravitational Force between the person and Earth = ?

G = Universal Gravitational Constant = 6.67 x 10⁻¹¹ Nm²/kg²

m₁ = mass of peerson = 50 kg

m₂ = mass of earth = 5.98 x 10²⁴ kg

r = distance between person and earth = radius of earth = 6.38 x 10⁶ m

Therefore,

F = 489.95 N

b)

The weight of the person will be given as:

W = 490 N

c)

Both have same value

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