Two isolated objects have a head-on collision. For each of the following
questions, explain your answer.
a. If you know the changcin momentum or onc object, can you find the
change in momentum of the other object?
b. If you know the initial and final velocity of one object and the mass of
the other object, do you have enough information to find the final
velocity of the second object?
c. If you know the masses of both objects and the final vclocitics of both
objects, do you have enough information to find the initial velocities.
of both objects?
d. If you know the masses and initial velocities of both objects and the
final velocity of one object, do you have enough information to find
the final velocity of the other object?
e. If you know the change in momentum of one object and the initial
and final vclocities of the other object, do you have cnough informa
tion to find the mass of either object?

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

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