Apickup truck is traveling down the highway at a steady speed of 30.1 m/s. the truck has a drag coefficient of 0.45 and a cross-sectional area of the truck is 3.3 m2. assume the density of the air is 1.2 kg/m 3. how much energy does the truck lose to air resistance per hour? give your answer in units of mj (megajoules).

The energy that the truck lose to air resistance per hour is 87.47MJ

Explanation:

To solve this exercise it is necessary to compile the concepts of kinetic energy because of the drag force given in aerodynamic bodies. According to the theory we know that the drag force is defined by

Our values are:

Replacing,

We need calculate now the energy lost through a time T, then,

But we know that d is equal to

Where

v is the velocity and t the time. However the time is given in seconds but for this problem we need the time in hours, so,

(per hour)

Therefore the energy that the truck lose to air resistance per hour is 87.47MJ

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