On a cold, 5°F day, the nosewheel tire of a Learjet, having an internal volume of 1000. in3 is inflated to 30 psi (i. e., 30 lb/in2) above the ambient pressure of 14.7 psi. Calculate the weight (in pounds) and specific volume of the air in the tire. (Be careful of units here--we usually use feet, not inches, with imperial units in this course, and you need to work with absolute temperatures.)

The weight in (pounds ) is

The specific volume is

Explanation:

From the question we are told that

The temperature is

The volume is

The initial absolute pressure is

Generally from ideal gas equation we have

Here m is the weight nose wheel tire in pounds

R is the gas constant of air with value

So

=>

Converting to pounds

Form this equation specific volume is

=>    

=>

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