Bill and Ted are wearing Velcro suits and are running towardseach other. Bill has a mass of 60 kg and is running to the rightat 4 m/s; Ted has a mass of 50 kg and is running to the left at4.8 m/s. When they collide, they stick together (because yaknow, Velcro). Calculate their velocity after colliding witheach other.

We know that in a collision the momentum is conserved, that is:

where the momentum is given by:

In this case the conservation of momentum can be express as:

where m1 and m2 are the masses of the boys, v1 and v2 are their initial velocities and u is the final velocity after the collision. In this case we know that:

Bill mass is 60 kg and the initial velocity is 4 m/s.

Ted mass is 50 kg and the initial velocity is -4.8 m/s (the minus sign comes from the fact that he runs to the left).

Plugging these values and solving for u we have:

Therefore, the velocity after they collide is zero. This means that after they collide, they stopped.

this is poiselle's equation from fluid mechanic in physics. mech eng

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