Aheat recovery system (hrs) is used to conserve heat from the surroundings and supply it to the mars rover. the hrs fluid loops use freon as the working fluid. the instrumentation must be kept as a temperature greater than negative 67−67 degrees fahrenheit [°f] to avoid damage. the temperature in the area of mars where the rover is exploring is 189189 kelvins [k]. if the system must remove 47.447.4 british thermal units [btu] of energy, what volume of freon is needed in units of liters [l]?

Explanation:

Given that:

quantity of heat to be removed,

we know,

density of freon,

latent heat of vaporization of freon,

So,

heat to be removed in joules,

Now, the quantity of freon required to remove the above mentioned heat:

Now, volume

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

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