In a lab experiment, two identical gliders on an air track are held together by a piece of string, compressing a spring between the gliders. while they are moving to the right at a common speed of 0.500 m/s, one student holds a match under the string and burns it, letting the spring force the gliders apart. one glider is then observed to be moving to the right at 1.300 m/s. (the string and spring both have negligible ) what velocity does the other glider have? (b) is the total kinetic energy of the two gliders after the collision greater than, less than, or equal to the total kinetic energy before the collision? if greater, where did the extra energy come from? if less, where did the "lost" energy go?

Part a)

Part b)

Here final kinetic energy is more than the initial kinetic energy

This increase in kinetic energy is due to spring connected between them as the spring energy is converted into kinetic energy of two blocks

Explanation:

Part a)

As we know that there is no external force on the system of two gliders

So here we can use momentum conservation for two gliders

So we will have

Part b)

now we will have

initial kinetic energy of both gliders is given as

Final kinetic energy of two gliders

so here final kinetic energy is more than the initial kinetic energy

This increase in kinetic energy is due to spring connected between them as the spring energy is converted into kinetic energy of two blocks

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