You stand on a frictionless platform that is rotating with an angular speed of 5.1 rev/s. Your arms are outstretched, and you hold a heavy weight in each hand. The moment of inertia of you, the extended weights, and the platform is 9.9 kg · m2 . When you pull the weights in toward your body, the moment of inertia decreases to 2.6 kg · m 2 . What is the resulting angular speed of the platform? Answer in units of rev/s. 017 (part 2 of 2) 10.0 point

Explanation:

Given:

angular speed of rotation of friction-less platform,

moment of inertia with extended weight,

moment of inertia with contracted weight,

Now we use the law of conservation of angular momentum:

The angular speed becomes faster as the mass is contracted radially near to the axis of rotation.

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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

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