When the temperature of an automobile tire is 20°c, the pressure in the tire reads 32 psi on a tire gauge. (the gauge measures the difference between the pressures inside and outside the tire.) what is the pressure when the tire heats up to 40°c while driving? you may assume that the volume of the tire remains the same and that atmospheric pressure is a steady 14 psi.

The initial pressure in the tire is given by the difference between the gauge pressure and the atmospheric pressure:

Let's also convert the initial and final temperature of the tire into Kelvin:

We know that the volume of the tire remains the same, so we can use the fact that the ratio between pressure and temperature of the tire remains constant:

which can be rewritten as

from which we can find the value of the final pressure, p2:

And converted back into PSI,

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