Ricardo, mass 85 kg, and carmelita, who is lighter, are enjoying lake merced at dusk in a 20 kg canoe. when the canoe is at rest in the placid water, they exchange seats, which are 3.0 m apart and symmetrically located with respect to the canoe's center. ricardo notices that the canoe moved 35 cm relative to a submerged log during the exchange and calculates carmelita's mass, which she has not told him. what is it?

65.14925 kg

Explanation:

Center of mass before the exchange

Center of mass after exchange

The center of mass remains constant so

Mass of Carmelita is 65.14925 kg

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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