A woman who has a mass 50kg is wearing high heel shoes. The area of each heel in contact with the floor is 0.45 cm 2 . What is the pressure exerted by the woman on the floor if A. she stands on the 2 heels. B. she stands on 1 heel only.

Explanation:

Pressure is defined as the ratio of force per unit area of a body

Pressure = Force/Area

a) Given mass of the woman = 50kg

Force exerted by the woman = 50×9.8

= 490N

Area of each each heel in contact with the floor = 0.45 cm² = 0.45×0.01m×0.01m = 0.000045m²

Pressure exerted by the woman standing on her two heels

= 490/2(0.000045){note that the area doubled)

= 5.44×10^6kg/m²

b) ,Pressure exerted if she stands on one heel only = 490N/0.000045 = 10.89×10^6N/m²

1/0.14nm = 10^10/1.4 a lot

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