A big red fish with a mass of 20 kg swims with a velocity of 2 m/s toward a small, stationary green fish which has a mass of 10 kg. The big red fish opens its mouth and swallows the small green fish. What will the big red fish's velocity be immediately after swallowing its meal?

1.33m/s

Explanation:

Given parameters:

M1  = 20kg

V1  = 2m/s

V2 = 0m/s

M2  = 10kg

Unknown:

V  = ?

Solution:

As with all systems, the momentum must be conserved and it implies that the starting and ending momentum be the same.

  M1 V1  +  M2 V2  = V (M1 + M2)

M1 is the mass of the big red fish

V1 is the velocity of the big red fish

V2 is the velocity of the green fish

M2 is the mass of the green fish

V is the velocity after swallowing

           (20 x 2) + (10 x 0)  = V (20 + 10)

                      40  = 30V

                      V  = 1.33m/s

answer: its c lololo

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