1. Consider 3 equal masses having values m = 50g fixed to the vertices of an equilateral triangle with sides of length a = 20cm as shown below. The masses are connected by thin rods of negligible mass.
m
60°
(a) (3 points) Find the center of mass of the system.
(b) (3 points) Find the moment of inertia for rotations of the system about an axis perpendicular to
the plane of the triangle and passing through point 0.
(c) (3 points) Find the moment of inertia for rotations of the system about an axis perpendicular to the
plane of the triangle and passing through the center or mass. Hint: Use the parallel axis theorem

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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