Abullet with mass 25g and initial horizontal velocity 320m/s strikes a block of mass 2kg that rests on a frictionless surface and is attached to one end of a spring. the bullet becomes embedded in the block. the other end of the spring is attached to the wall. the impact compresss the spring a maximum distance of 25cm. after the impact, the block moves in simple harmonic motion. 1. what is the frequency of the oscillation? 2. sketch graphs for the block’s position, velocity, and acceleration as a function of time (x vs. t, v vs. t, a vs. t). check to make sure your graphs are consistent. 3. write an description of what is happening to the energy in this system from the time the bullet is fired until the block returns to its starting position for the first time. meaning, tell a story about how the energy changes form or moves from one object to another.

watch you tube or play clash royale, mainly clash royale

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