Eric has a mass of 60 kg. he is standing on a scale in an elevator that is accelerating downward at 1.7 m/s². what is the approximate reading on the scale?
a. 0 n
b. 490 n
c. 590 n
d. 690 n

option B

Explanation:

given,

mass of Eric = 60 Kg

acceleration o f the elevator downward (a)= 1.7 m/s²

acceleration due to gravity (g) = 9.8 m/s²

reading of scale = ?

when elevator is going down there will be a pseudo acting on Eric so, negative acceleration will be acting.

so, weight will be equal to

W_{apparent} - mg = - ma

W_{apparent} = m (g - a)

W_{apparent} = 60 ( 9.8 - 1.7 )

W_{apparent} = 60 x 8.1

W_{apparent} = 486 N

so, Weight will be approximately equal to 490 N

the correct answer is option B

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