Romeo (85.0 kg) entertains juliet (59.0 kg) by playing his guitar from the rear of their boat at rest in still water, 2.70 m away from juliet, who is in the front of the boat. after the serenade, juliet carefully moves to the rear of the boat (away from shore) to plant a kiss on romeo's cheek. how far does the 75.0-kg boat move toward the shore it is facing?

To solve the problem it is necessary to apply the concepts related to the center of mass in a system.

The general formula of the center of mass is given by:

Where

Coordenate according the Reference

Mass of objects

For this problem we have three bodies defined: Romeo, Juliet and the Boat. In this way,

When they approach to kiss, the movement generates two things, the first is that the center of mass remains at the same distance as it was previously from the shore, however, it generates a substantial change with the back of the boat.

The displacement of the boat would then be given by the change of position which is

the cellphone, they would then know if the killer would have contacted them or always hated them. or if it was a breakup. but if that is not the case, then it would be the clothing. to put in a bullet, it would have to be put in by hands. hands have finger prints which, would have giving you the answer of who done it.

explanation:

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