Aregulation table tennis ball has a mass of 2.7g and is 40mm in diameter. what is its moment of inertia about an axis that passes through its center?

Explanation:

The moment of inertia of a sphere about an axis passing through its center is given by:

where

M is the mass of the sphere

R is the radius of the sphere

For the tennis ball in this problem, we have the following data:

Mass: M = 2.7 g = 0.0027 kg

Radius: R = d/2 = 40 mm / 2 = 20 mm = 0.020 m

Therefore, the moment of inertia is

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

inverse v=i*r

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