The satellite s travels around the earth in a circular path with a constant speed of 20 mm> h. if the acceleration is 2.5 m> s2, determine the altitude h. assume the earth's diameter to be 12 713 km.

The altitude of planet = 5989.198 km

Explanation:

    We know that centripetal acceleration, , where v is the velocity and r is the radius. In this case both acceleration and velocity is given, so we can find radius of satellite.

    v =

    a =

 So,  

 We have diameter of earth = 12713 km

        Radius of earth = 12713/2 = 6356.5 km

   The altitude of planet = Radius of planet - radius of earth

                                         = 12345.698 - 6356.5

                                         = 5989.198 km

the answer is d. 4

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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