5ptsa car with mass m=1.42e3 kg is initially traveling directly east with a speed =25.0 m/s. it crashes into the rear end of a truck with mass =9000 kg moving in the same direction with speed =20.0 m/s. immediately after the collision the car has a speed =18.0 m/s in its original direction (the two do not stick together in this case). (a) what is the speed of the truck immediately after the collision?

m/s ( ± 0.2 m/s)

(b) the same two vehicles collide with the same speeds, but while the car is still traveling east the truck is going north when they collide, and this time they stick together. what is the speed of the car/truck combination just after the collision?

m/s ( ± 0.2 m/s)

(c) after the collision in part (b), in what direction is the combined wreckage moving? measure the angle in degrees away from due north.

degrees ( ± 0.1 degrees)

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