Newton measured the centripetal acceleration of the moon in its orbit around earth by comparing the force earth exerts on the moon with the force earth exerts on an apple. he obtained a value of ac = 2.66×10-3 m/s2. if newton had taken the mass of earth to be me = 5.97×1024 kg and the mean distance between the centers of earth and the moon to be rme = 3.86×108 m, what value would he have obtained for the gravitational constant, in units of n⋅m2/kg2?

Explanation:

According to Newton 2nd law of motion: F = ma where m is the mass of the moon and a is the centripetal acceleration of the gravitational force.

Also Gravitational force formula

where G is the gravitational force, ME is the mass of Earth and S is the mean distance between Earth and Moon.

As the moon is at constant circular motion around Earth, there forces balance out:

We can now substitute and and

d) physical means can be used to separate the components of air.

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