1. What amount of work is done when a force of 50 N is used to drag an object a distance of 20 meters across a floor? 2. What's the kinetic energy of an object that has a mass of 12 kilograms and moves with a velocity of 10 m/s?

3. A skateboarder is inside of a half-pipe, shown here. Explain her energy transformations as she jumps off at point A, slides to point B, and finally reaches point C.

4. If the skateboarder continues going back and forth on the half-pipe, she'll eventually come to a stop at the bottom automatically. Explain why, in terms of her energy.

layer a is the exosphere and layer b is the thermosphere.   is the answer i think but i hope this .

number of electrons for neutral cl

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