2.Two children play a game of catch, running back and forth to catch each throw from the other. Assume the children are standing 5m apart with one child standing at the origin before the game begins. The ball makes the following motions:

5 meters right, 8 meters left, 3 meters right, 6 meters left, 15 meters right, and 4 meters left.

Part A:
Calculate the total distance traveled by the child on the left.

Part B:
Calculate the total displacement of the child on the right.

Part A: 24 m

Part B: 9 m

Explanation:

Part A:

The children takes turns so the child on the left moves with when the ball moves 5 meters right, 3 meters right, 15 meters right, while the child on the right moves with when the ball moves 8 meters left, 6 meters left, 4 meters left

The total distance traveled by the child on the left is given by the relation;

Initial position of the child on the left = 5 m

First motion of the child on the left = Distance to origin + first distance ball moved

∴ First motion of the child on the left = 5 + 5 = 10 m location of child = 5 m left

Second motion of the child on the left = location of child - position of the ball = 5 - (5 - 8 + 3) = 5 m left location of the child = 0 m

Third motion of the child on the left = location of child - position of the ball = 0 - (6 - 15) = 9 m right

Total distance traveled by the child on the left = 10 + 5 + 9 = 24 m

Part B:

First motion of the child on the right = Distance of child to origin + second position of ball

Initial location of the child on the right = 0 m

∴ First motion of the child on the right = 0 + (5 - 8) = -3 m location of child = 3 m left

Second motion of the child on the right = location of child - current position of the ball = 3 - 6 = -3 m left location of the child = -6 m

Third motion of the child on the right = location of child - position of the ball = -6 - 5 = 11 m right

Final location of the child on the right = 9 m right

Total displacement of the child on the right = Final location of the child on the right - Initial location of the child on the right 9 - 0 = 9 m.

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